Many get 80 days from a 10K vial at 250iu EOD with no problems. Must use BA water, 0.9% benzyl alcohol. Drug companies need to come up with an expiration date so make something up - meaningless. Note that original use for hCG was for female IVF where 3,000 - 5,000 were injected all at once; so the low dose use by males was not anticipated.
If your testes do not shrink, I guess you are OK. We have seen hCG damaged easily from wet shipping, so its easy to conclude that it is fragile. Google this and it seems to be an OJ thing to do.