My husband insists that men can only physically go on with no sex (or masturbation) for a maximum of 3 days. Is this true?

it really depends on his own self control. during my pregnancy and until my son is 10months old we didnt had sex. because during pregnancy i was too sensitive and after gave birth, breastfeeding is too tiring... but i do feel his mood is slightly more impatient without sex. haha