diff --git a/src/common/ui-protocol.cpp b/src/common/ui-protocol.cpp
index 6b975cca9..1452ac0b9 100644
--- a/src/common/ui-protocol.cpp
+++ b/src/common/ui-protocol.cpp
@@ -43,7 +43,7 @@ namespace stage {
   const Symbol ATTR_name{"name"};
   const Symbol ATTR_fork{"fork"};
   const Symbol ATTR_assets{"assets"};
-  const Symbol ATTR_start{"start"};
+  const Symbol ATTR_timing{"timing"};
   
   
   /* ======== UI-Element protocol ======== */
diff --git a/src/include/ui-protocol.hpp b/src/include/ui-protocol.hpp
index 9712d7df5..bc4a3a7e0 100644
--- a/src/include/ui-protocol.hpp
+++ b/src/include/ui-protocol.hpp
@@ -82,7 +82,7 @@ namespace stage {
   extern const Symbol ATTR_name;
   extern const Symbol ATTR_fork;
   extern const Symbol ATTR_assets;
-  extern const Symbol ATTR_start;
+  extern const Symbol ATTR_timing;
   
   
   /* ======== UI-Element protocol ======== */
diff --git a/src/stage/timeline/clip-presenter.cpp b/src/stage/timeline/clip-presenter.cpp
index 9d25d0f51..cd4481569 100644
--- a/src/stage/timeline/clip-presenter.cpp
+++ b/src/stage/timeline/clip-presenter.cpp
@@ -71,14 +71,14 @@ namespace timeline {
    * @param startTime (optional) start time point of the clip.
    * @note Clip can not be displayed unless startTime is given
    */
-  ClipPresenter::ClipPresenter (ID identity, ctrl::BusTerm& nexus, WidgetHook& view, optional<Time> startTime)
+  ClipPresenter::ClipPresenter (ID identity, ctrl::BusTerm& nexus, WidgetHook& view, optional<TimeSpan> timing)
     : Controller{identity, nexus}
     , channels_{}
     , effects_{}
     , markers_{}
     , widget_{}
     {
-      ClipDelegate::buildDelegate (widget_, view, startTime);
+      ClipDelegate::buildDelegate (widget_, view, timing);
     }
   
   
diff --git a/src/stage/timeline/clip-presenter.hpp b/src/stage/timeline/clip-presenter.hpp
index a2546641c..376360b25 100644
--- a/src/stage/timeline/clip-presenter.hpp
+++ b/src/stage/timeline/clip-presenter.hpp
@@ -71,7 +71,7 @@ namespace timeline {
   using std::vector;
   using std::optional;
   using std::unique_ptr;
-  using lib::time::Time;
+  using lib::time::TimeSpan;
   
   class MarkerWidget;
   
@@ -97,7 +97,7 @@ namespace timeline {
       
       
     public:
-      ClipPresenter (ID, ctrl::BusTerm&, WidgetHook&, optional<Time> startTime);
+      ClipPresenter (ID, ctrl::BusTerm&, WidgetHook&, optional<TimeSpan>);
       
      ~ClipPresenter();
       
diff --git a/src/stage/timeline/clip-widget.cpp b/src/stage/timeline/clip-widget.cpp
index d24bb5a58..e4066c65b 100644
--- a/src/stage/timeline/clip-widget.cpp
+++ b/src/stage/timeline/clip-widget.cpp
@@ -186,7 +186,7 @@ namespace timeline {
         
         
       public:
-        ClipWidget(WidgetHook::Pos hookPoint, uString clipName)
+        ClipWidget(WidgetHook::Pos hookPoint, Duration dur, uString clipName)
           : HookedWidget{hookPoint, clipName}
           , ClipDelegate{}
           { }
@@ -239,15 +239,15 @@ namespace timeline {
   
   
   ClipDelegate::Appearance
-  ClipDelegate::buildDelegate (PDelegate& manager, WidgetHook& view, optional<Time> startTime)
+  ClipDelegate::buildDelegate (PDelegate& manager, WidgetHook& view, optional<TimeSpan> timing)
   {
-    if (startTime)
-      manager.reset (new ClipWidget{view.hookedAt(*startTime, defaultOffsetY), defaultName});
+    if (timing)
+      manager.reset (new ClipWidget{view.hookedAt(*timing, defaultOffsetY), timing->duration(), defaultName});
     else
       manager.reset (new ClipData{view});
     
-    return startTime? Appearance::COMPACT
-                    : Appearance::PENDING;
+    return timing? Appearance::COMPACT
+                 : Appearance::PENDING;
   }
   
   
diff --git a/src/stage/timeline/clip-widget.hpp b/src/stage/timeline/clip-widget.hpp
index 00c4058a5..2b8fe5318 100644
--- a/src/stage/timeline/clip-widget.hpp
+++ b/src/stage/timeline/clip-widget.hpp
@@ -119,6 +119,8 @@ namespace timeline {
   
   using std::string;
   using lib::time::Time;
+  using lib::time::Duration;
+  using lib::time::TimeSpan;
   
   using WidgetHook = model::CanvasHook<Gtk::Widget>;
   
@@ -131,6 +133,8 @@ namespace timeline {
    */
   class ClipDelegate
     {
+      TimeSpan timing_;
+      
     public:
       virtual ~ClipDelegate();   ///< this is an interface
       ClipDelegate();
@@ -196,7 +200,7 @@ namespace timeline {
        *  viable appearance style. This is the first incantation of #switchAppearance.
        */
       static Appearance buildDelegate (PDelegate& manager, WidgetHook& view,
-                                       std::optional<Time> startTime);
+                                       std::optional<TimeSpan> timing);
       
     private:/* ===== Internals ===== */
      
diff --git a/src/stage/timeline/track-presenter.hpp b/src/stage/timeline/track-presenter.hpp
index a6ce8887d..b94ed2dd5 100644
--- a/src/stage/timeline/track-presenter.hpp
+++ b/src/stage/timeline/track-presenter.hpp
@@ -115,7 +115,7 @@ namespace timeline {
   using std::unique_ptr;
   using std::make_unique;
   
-  using lib::time::Time;
+  using lib::time::TimeSpan;
   using lib::diff::TreeMutator;
   using lib::diff::collection;
   using lib::explore;
@@ -314,8 +314,8 @@ namespace timeline {
                   })
                .constructFrom ([&](GenNode const& spec) -> PClip
                   {
-                    std::optional<Time> startTime = spec.retrieveAttribute<Time> (string{ATTR_start});
-                    return make_unique<ClipPresenter> (spec.idi, this->uiBus_, display_.getClipHook(), startTime);
+                    std::optional<TimeSpan> timing = spec.retrieveAttribute<TimeSpan> (string{ATTR_timing});
+                    return make_unique<ClipPresenter> (spec.idi, this->uiBus_, display_.getClipHook(), timing);
                   })
                .buildChildMutator ([&](PClip& target, GenNode::ID const& subID, TreeMutator::Handle buff) -> bool
                   {
diff --git a/wiki/thinkPad.ichthyo.mm b/wiki/thinkPad.ichthyo.mm
index 405bc66be..8f76c97ec 100644
--- a/wiki/thinkPad.ichthyo.mm
+++ b/wiki/thinkPad.ichthyo.mm
@@ -28306,6 +28306,37 @@
 </html></richcontent>
 <arrowlink COLOR="#9a5670" DESTINATION="ID_1054753498" ENDARROW="Default" ENDINCLINATION="-3030;165;" ID="Arrow_ID_948617682" STARTARROW="None" STARTINCLINATION="991;88;"/>
 </node>
+<node CREATED="1586383134447" ID="ID_415124968" MODIFIED="1586383138432" TEXT="Clip-Timings">
+<node CREATED="1586383139624" ID="ID_683488370" MODIFIED="1586383149522" TEXT="gegeben als TimeSpan"/>
+<node CREATED="1586383150821" ID="ID_51987562" MODIFIED="1586383287858" TEXT="&#xdc;bersetzung in Pixel ist rein Client-seitig">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      Zoomen, Scrollen, Scroll-Window und View-Path sind reine Gui-Bildungen und werden instantan ohne Round-Trip realisiert
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="yes"/>
+</node>
+<node COLOR="#821a26" CREATED="1586383188716" ID="ID_1268226317" MODIFIED="1586383420749" TEXT="mu&#xdf; daher komplett im Clip gespeichert werden">
+<richcontent TYPE="NOTE"><html>
+  <head>
+    
+  </head>
+  <body>
+    <p>
+      <font color="#e12e2e"><b>Vorsicht Falle</b></font>: es reicht nicht, nur die auf Pixel quantisierte Position zu speichern, denn diese wird bei geringem Zoom relativ ungenau. Es w&#228;re leicht m&#246;glich, durch Heraus- und wieder Hereinscrollen die sichtbare Position eines Clip massiv zu verschieben.
+    </p>
+  </body>
+</html>
+</richcontent>
+<icon BUILTIN="messagebox_warning"/>
+</node>
+</node>
 </node>
 <node CREATED="1583678040736" ID="ID_1805643410" MODIFIED="1583678050738" TEXT="Umsetzung">
 <node CREATED="1583677631958" ID="ID_811510338" MODIFIED="1583678064711" TEXT="vorl&#xe4;ufige Clip-Repr&#xe4;sentation">