1. dun make him feel like u're his mum.
2. if he heading out drinking with frens, dun make him commit a timing unless u need to prepare bath for him when he gets home, or if u're preparing dinner etc.. When out on guy's nite, it's hard to gauge the time, guys outing seldom all meet at one time and end at one time... some come early, some come later, some come when u're abt to go... hard to give a time.
3. i believe guys should give a rough time like before/after midnite etc. but i dun believe ladies should ask for the time... even if u need to, put in in other ways... ie "if u're drinking past midnite, just promise u'll drop me an sms and i'll take a cab down to drive u n the car home", u'll likely get a rough time from here. pls vary accordingly...
4. who he is with... well for safety i think he might wanna name 1 person. but u sorta gotta phrase the question well... sometimes it's the way u ask... if it sounds like a questioning then he's gonna feel irritated.
all said, 1st 2-3 times set some SAFETY ground rules, regards to drink-driving and promising not to catch rides from equally intoxicated frens, but say it ONCE only. if he breaks it 3 times, then OK, u start to be abit naggy... else if he has not screwed himself nor acted irresponsibly, just trust him. he was drinking before he had u as a wife... he dun need your wifely duties to inclde the nags.
deal with your own need to be worried. we're all adults and perfectly fine before we met our spouses... dun worry nor fuss your marriage into a failure.
PS: i dun think u're too much, neither do i think u're totally ok. i just think perhaps u might wanna rephrase your tones and adjust the way u put across to him... if u sound like your own mother, then that's how Not to do it.