So like
What happens when the hour limit comes up mid boss fight
They say the ad experience won't interrupt gameplay, but... that sure sounds like an interruption.
I considered this, but feels like it would take a lot of extra work to set flags for what parts of games can and can't play an ad. And also, that's exploitable, like what if a game has a glitch to make it think a cutscene is playing and that just turns ads off forever? So nah, it'd just be a timer.