Given my particular job, location, and situation, I have a luxury of time that few can understand. Also the flying field is just a 15 minute drive away plus I have a huge grass playing field just in front of the house (on campus). So I really don't have any excuses not to be flying virtually every day that the weather allows. But still I find myself coming up with "reasons" to do something else instead. I really need to force myself not to build during good flying hours. Build at night! Build in the rain! Fly when I can fly.
My biggest problem is probably that I often don't have a model in current flight ready condition! At the moment I have one ready to go. But repairs can take time because there is no LHS to run to for supplies.
There are times, however, when I think that I spend entirely too much time on this "hobby" and really should find something more "serious" to do with my time. Luckily, I don't have too many of those days.