If the active life of test e and deca is 15 days according to the profiles on this forum, why should it be shot twice a week? If the active life is 2 weeks I see no reason why shooting it once a week would not yeild the same blood plasma levels as twice a week. On my only test e cycle I shot it once a week and I had no problems at all. I was planning on switching to twice a week this cycle however I am not seeing the point if the half life is one week.