ok the last of our cats is getting fixed on monday , i had my females done over 2 months ago now and still got 2 females to go once there old enough. he goes in monday morning but has to stay over? i knew females had to here but i dint know about males? i thought it was more of a simple op? its been so long since i had to have a male cat done 5 years ago , so maybe things changed ? as back then they came out early evening.