TuneInInfo
Tune-in (join-in-progress) detail attached to an AdBreakBeginEvent when the viewer joined while the break was already in progress. remainingSec is the effective duration the break is presented for.
Prefer AdBreakBeginEvent.elapsedSec / AdBreakBeginEvent.remainingSec, which are reported for every break-start. Reading the values through this object misses every part-way join that fell inside the scheduler's start tolerance.