5 weeks should be sufficient. 3.5 or 4 would probably work also.
As for the timing of blood draw it varies between esters. Some studies suggest TC/TE peaks around 24 hours. Others lean toward longer periods.
@Boilermech tested this theory, drawing blood at 24, 48, and 72 hours and his highest point was around 72 hours, I believe? He will clarify I'm sure. I am going to replicate the conditions of his experiment and see what I come up with. I just won't be able to do it for a few months.
Intersted in getting blood drawn at 24, 48 and 72?
I'm hoping we can get enough guys to do this. I started a blood work protocol thread that set the blood draw at 6 weeks 48 hours +/- 12 from last pin.
Link here:
https://thinksteroids.com/community/threads/meso-blood-work-testing-protocol.134359960/
We need more bloods to verify this is in fact the proper window for testing. I believe it is or pretty close. I will update the protocol if need be, once we have enough data.