if neither of you feel cramped by the other, it's fine. don't worry about it unless it is causing problems. when it starts to cause problems, then worry about it. to be honest, i used to spend a ****ing shitload of my time with my girlfriend, and it never had any detrimental effect on our relationship, althought it could depend on the relationship/people involved. spend as much time together as you feel comfortable with, and no more, otherwise you will find your S.O. annoying you, which you will resent them for, which will lead to a breakdown of your relationship.