four months jamaat

Q: I just wanted to ask that a Moulana wants me to go 4 months jamaat with him but then it'll mean that it will take me another 6 months to finish my studies. What should I do, just go 3 days each month and finish my studies then go 4 months or go 4 months then come back and carry on studies?

Q: If one goes for four months jamaat and wants to come home after two months. Does he have to redo the four months later on?