The number of seconds spent rendering this item.Integer, or null if item has not been rendered; read-only.
The markerﾒs duration, in seconds. The duration appears in the Timeline panel as a short bar extending from the marker location.Floating point; read/write.
The duration of a frame, in seconds. This is the inverse of the frameRate value frames-per-second .Floating-point; read/write.
The duration in seconds of the composition to be rendered. The duration is determined by subtracting the start time from the end time. Setting this value is