4 weeks is as long as I will run it! The Insomnia kicks in around week 3 for me, and it is no joke. I feel tren almost instantly (3-4 days).The other Sides are not as bad as people think.
I would strongly suggest running it ED. You will keep your blood levels more constant. If it means shooting only 50mg/day it is still better than 100 eod IMO.