i have taken time off and on over the last 5 years, usually on for 6 months then off for a one/two, then on for 8 then off for a couple/few. usually due to health issues. it has been my experience that if i took a month off, i could usually come back and in two weeks my joints and tendons would be ready for the strength increases of a prohormone, but if taking off 3 or 4 months, i would advise at least 1 months, if i was u i would train heavy and get my diet down for at least 6 weeks then i would take a few days off and then use the ph's. this way u can get ur diet to be spot on, have a stronger foundation to build more upon, and already have gained back alot of the strength u lost during time off.
it would suck to do it too early and then get massive joint/tendon/ligament issues or possibly suffer a strain on a muscle just from too much strength increases and then ur whole cycle goes to shame. i know u want it quick but the more patient route is definetely worth it to ensure success.