Currently the mentor dashboard says that to keep up with demand, each mentor needs to handle on average 20 submissions per week. That would mean five minutes per exercise if you spend an hour, which I think should be plenty.
Some difficult exercises may require more time and a bit more back-and-forth, but then on the other hand there are some simple ones in the beginning that often just requires a âwell done and good luck on the next oneâ.
Anyway, the system doesnât require you pledge any particular amount of time. As long as you can commit to finish coaching someone through an exercise once you picked it up, it should not be too overwhelming.