I use a 15 minute block on an addictive yet relaxing game, with a 1h timeout.
What I’ve found very unsettling is when I expect to have 15 minutes of play time but it expires much sooner because I played it for 5-10 minutes HOURS ago.
If more time has elapsed than the timeout itself, I should get a full block of time with it.
The way it is now encourages spending MORE time with your restricted apps so that you trigger a timeout.