ACTUALLY i have seen some blood level charts that show that even undecoanate esters peak in about two days and RAIPDLY decline t almost insignificant levels within 4 or 5 days. so in my opinion, i would never go more than 2 days in between shots. if im only running 1 cc a week ( cruising, id probably cut it with some kind of oil, and shoot 1/3 cc eod