Aromasin has a very short half life in males. Something like 8 hours or so. You need to do it twice daily for maximum effectiveness with a good amount of fats. It has poor bioavailability when consumed without fats. It also does not lower estrogen nearly as much as people believe as all the studies people quote were on women, which are effected by AI's very differently.
No once a day. The half life is 27hrs. It lowers estrogen enough that's for sure.