I will agree with Kel on the whole, but I believe that the longer you stay on (without HCG especially), the longer it will take to recover. The Leydig cells in the testicles go in a sort of dormant state when exogenous testosterone is administered due to a lack of stimulation from LH produced by the pituitary gland. From what I’ve researched and gathered, the longer the testicles remain in this dormant state, the harder it is for them to “wake up.” This makes sense, otherwise people could run cycles indefinitely without ever needing to get on TRT. Most people eventually lose their ability to recover their original testosterone levels after a number of cycles.
Later this year I plan on coming off completely to procreate and I’ll find out how much the HCG helped.