I have spend all my free time lately mapping >_<
However, it has easily been 3 years since I even looked at a mapping program, and probably 7 or 8 since I have done anything serious.
Back when I was serious about mapping for Q3A I would usually map frantically for extended periods then take a few days off to think then get back to mapping.
As for actual time, it depends on what is going on. The last couple days I have had alot of free time and only had to run a few errands on the weekend here, so have put in quite a few hours.