How the "10 minutes have passed" disconnect should work.

10 minutes have passed. No gens have been completed.

Killer now has the option to "Begin Trial Collapse" OR Abandon as a draw for everyone still in the trial.

Upon clicking it, an EGC-like timer appears. Like normal EGC, downed/hooked survivors slow it.

Survivors get a repair boost to compensate for missing survivors;
::: 4 survivors: No bonus
::: 3 survivors: +33% repair speed, no gate bonus.
::: 2 survivors: +100% repair speed, 25% faster gate speed
::: 1 survivor: +300% repair speed, 50% faster gate speed.

The hatch additionally spawns with 2 or more survivors (closed, can be unlocked with a key, only the user escapes).

Completing a gen will reset the timer, but not end it. If no generator is complete within the timer, all remaining survivors are sacrificed.

This is basically meant to be a mad scramble for the survivors to escape the trial; give them more power, but put them on a strict limit, forcing them to do or die. This also gives power to survivors in a 2v1, giving them the ability to doggedly continue and perhaps still make it even alone. It also gives killers who'd otherwise not abandon and keep going to everyones annoyance a reason to force the end of the match, one way or another.