I always recommend 3 weeks and follow 3 weeks after last injection. At 2 weeks a long ester Test is still very much active and kicking in your system. It takes about 3 weeks to start dying down but, is probably still elevated and producing abit.
So at 4 weeks its probably completely gone and your levels are def starting to come back down which is why I prefer on the 3rd week. That way test levels would not be dropping while estrogen is still high. But, this is just me.