You guys are lacking sexual chemistry. Sex should be mutual and not done out of obligation or duty buh should be spontaneous and without timetable of day or night.
I doubt he last up to 2-3 mins on you.
You can try to improve your communication 1st as that will be the key area you need to work on first.

6 weeks ke. O girl na wa o. Ask him what is wrong in a sincere conversation. Does he have health issues, is he gay,.... You may not get the answer you are looking for. So be prepared

Dadasamuel08:
Guys I need your advice... my husband and I have been married for 6 years in those six years I can count how many times we made love simply cos he can go weeks without asking okay I have been the one asking more than he does but now I feel he should know his obligation s as a husband and I have discussed it over and over again but he seems not to have changed he only ask for sex when he feels like having sex which might be twice or once a month. I like sex but I can do without it however am concern about the future of a marriage without a committed emotional attachment... what should I do?

Sounds like he's got a low sex drive.