My Master and I live a 24/7 lifestyle. I am his slave, and I think about him often when I am in vanilla settings, like at work. When I am with him, I get him his food and drink, and am ready and willing whenever he wishes.
One of the nicest and most wonderful things about my Master is the fact that he understands me and takes my needs into account. If I am very exhausted from pleasing him and doing his wishes, he is willing to make sure that I get enough sleep for work. But it's not if I WANT it...he knows where my limits are, if I'm just kind of tired or really exhausted. I think that is one of the things I love most about my position with him. I can trust him because he knows and can read me so well.
I would be very discontent if we only had a sometimes relationship. I would spend a lot of my time craving his presence, wishing I was at his side. I am fairly certain that it would be a lot harder for me, and much prefer the situation as it is.