I've tried blasting with the same compound for 20 weeks before but honestly right about 12 to 14 weeks all the gains started slowing down. If you wanna run test more than 16 weeks you're gonna have to boost the dosage on the tail end of the cycle to keep seeing gains. Or possibly add another compound. Maybe run 20 weeks but the last 4 go to 600mg test and toss in 40 mg every day of anavar