However long you want to be anabolic AF. That’s a serious statement btw. People who say you need X weeks for something to “kick in” don’t know how anabolics work and probably aren’t taking enough or doing enough on their part for results.
It takes about 5 half lives to reach full blood saturation levels of a given weekly dose, and to clear it. So if Trest enanthate lasts for ~7 days, that means it will take about 5 weeks of pinning X dose to reach the highest levels it will concentrate at. But that doesn’t mean it’s not working right away - it is, and you generally don’t need as much of something when you start it to see results. So this escalation is fine because as the weeks go on the blood levels are building to help keep gains coming as you grow and accommodate.
And even if you don’t pin for even 5 weeks, it will still keep building up as it releases out, before pyramiding back down. Once you are on the down turn of the total blood levels, while it’s clearing, you probably won’t really be growing (unless you were already taking way more than you needed from the start), but you will still be enhanced and have improved training, recovery, and help lock in more of those new gains that came earlier.
Say you have a 10cc vial, and you take 2cc of Trest E per week. Levels will keep building up the first 5 weeks or so, plateau out, then clear at a similar speed. So you will probably be making gains for a good 7 weeks, and benefiting overall for 10 weeks.
Trest is a terrible compound if you need to PCT btw, so don’t take it if not cruising or on TRT. And 2cc/wk of Trest e might be way too much; I don’t know how yours is dosed or how much gear you need to grow, but Trest is super strong per mg. 5-10x testosterone. My brovice is use the lowest doses you can to get the end results you need. Don’t pussyfoot around and not make gains, but don’t bandaid crappy diet, sleep, & training with excess steroids. They cost your health.