Its more of a learning experience for the players really. Mentors are just the ones who guide them there.

If they clear then thats great, but most of those attempts are fail groups that are really there for just practice. And the sad thing is if you run through the time and dont clear, it doesnt count towards your mentor roulette counter and ends up being a waste of time for the mentor.

Thats why when you see mentors getting placed in ex trials they often just leave because they know what they are in for.