If you are taking break coz of mental stresss, you even dont have to go to nepal coz you can relax even in united states. If you are taking break coz you have some kind of emergency back in Nepal, you have to leave, but doesnot need to leave immediatley. In the latter case, you have to go to Nepal at least once during your break otherwise it can be a issue. Remeber, you can work ( legal or illegal ;) before you go to Nepal, but  if you go to Nepal  I dont think you can come back before 60 or 90 days from the starting date of your class. A friend of mine worked here almost 4 months and went nepal for a month and didnot have any problem.

Good luck ,

and welcome to Sajha!!