Like deca said, if you ended your cycle with a fast-acting, short ester test like prop, then you can start clomid therapy sooner and thus get your natural test production back up to normal sooner. Everyone is different, but I feel like the boys are back in business after 4-5 weeks. Stumpy, as far as receptors go, your receptors "grab" whatever is in your bloodstream at the time. As soon as your test levels drop, there is less test in the blood to attach to those receptors. I personally don't buy the "worn-out receptor" theory where they say the receptors need a break. Just my opinion.