so if I tapered to 250mg a week that would take how long to clear?
Depends on what you mean by clear, average man produces between 50 to 100mg of free test a week so you can estimate the levels of free test in your body will probably need to drop into that 8 - 15mg a day range to be completely independent of clomid.
May aswell say 200mg since thats probably the amount of free test equivalent youre gonna get, first half life 100mg, second 50mg and at this point you're probably safe to start clomid which is going to trick the brain into assuming its low on test anyway, the point is by the end of your 3-4 week period on clomid exogenous test levels are going to be negligible.
I usually run one shot of test e weekly for however long it takes everything else to get lost then a 2 week break before solo clomid.
This alongside hcg on cycle used sensibly basically tricks your body into never ceasing test/sperm production.
Never lost libido bar my first cycle which prompted the in depth research and my balls have never shrunk as far as I can tell.