How long was your DH on clomid before he saw improvement in his SA?

My DH has been on clomid since April 8th and just had a follow up SA yesterday. I know it is technically not 3 months, but we are looking to start our next fresh IVF cycle when I get AF next (I just got AF today - so in 28-30 days) and his urologist wanted to see if there was any change. Needless to say, there was no change...