I've done two ten week cycles with tren. I didn't notice an increase in the sides after week six, but I did get more tired of the sides (night sweats, unable to sleep, high temperature, and dry mouth) I did have. Both times by week ten, I was ready to stop. So, ask yourself what you're willing to put-up with. I'd suggest going for ten weeks with the expectation that you might decide to cut it short.