I'm a student, worker, and a parent. Levequests are totally worth doing. I can span them all in either 45 min to 2hrs depending on how challenging I want to make them. I get about 1/3 of my level at rank 45 per leve day (1.5 days). Grind parties are good too, but they can't be done in 30 minute spurts like levequests can. Being a father of a 3 month old makes it hard to stay playing, and I usually only get 15 minutes at a time while he takes a cat nap. That's just enough time to do a levequest.