Long Hallway (5e Trap)
From D&D Wiki
This incredibly long hallway appears to go on forever. It is, actually not that long, only about 50 ft, but those who walk in it are magically slowed. The hallway will take 10 minutes to walk across, and the slowness is imperceptible, magic does nothing to stop it. Every minute spent walking, creatures inside must make a DC 10 + minutes spent walking Charisma, or forget what they are doing and stop, and then sit down and take a short rest, or start walking back out. When walking out, time returns to normal, unless they turn around and start walking back through.