i didnt see if anyone posted about it in here but activity levels effect these as well with esters as well as how much muscle mass you carry. i have seen active larger dudes on hrt levels go down to single digits after 200mg test e 1x per week. so 200 e 7 days later labs drawn and it lands in single digtis then at 4-5 days it lands in the mid 500s. dude does iron man comps and is a really big dude for that kind of stuff and strong as all hell. another older friend of mine on 200 cyp will land in the mid 200s after 7 days and only trains 3 days a week on a power lifter split. both are about the same age. those arent the only ones i have seen with clients i work with across the age spectrum. so pretty much its a rough estimate imo