Represents the "T" entry of the media duration dictionary object.

It is defined as part of the PDF 1.0 specification.

It contains a TimespanElement.

For definitive details see:.

The ISO PDF Specification, ISO 32000-1:2008 PDF 1.7; Table: 281, page 498.

The ISO PDF Specification, ISO 32000-2:2017 PDF 2.0; Table: 292, page 623.

The T entry references a timespan dictionary giving the playback duration when S is T. Playback stops after this duration regardless of the clip remaining length.