This has been something that's bothered me for a while now and I feel this can't be intentional.

Stealth checks are made literally every second you are in line of sight of anyone while in turn based mode. Even when standing still and not moving.

The point of turn based mode is to put a pause on things and give the player time to react, not make it so the player has to roll dice 50 times a minute to stay hidden.

The dice should be rolled once upon entry and again per x ft moved.