MJ in your system?
really depends how much you were smoking.
May be a month or two, if you were a chronic chronic user like me, it may be 4-6 months.
It can store in the fat cells, and spike out later.
I was told by the famous Dr. Drew, no wonder I never had any MJ withdrawals, I was smoking so da*m much, it just tapered out of my system.................lucky me! !
Tom