check this website out
http://www.leangains.com/2010/04/leangains-guide.html
It all depends on my workload but right now I'm quiet so I hit the gym pretty much everyday - I listen to my body and take breaks when required. We tend to go away every 2-3 months for a week so I use that as rest periods. Recently I've been training:
Sun - legs
Mon - Arms & Abs
Tues - Chest & Biceps
Weds - Back
Thurs - Shoulders & Triceps
Fri - Arms & Abs
Sat - Upper body routine or pick out lagging muscle groups
I walk the dog for an hour most days and will add in 20-30mins cardio after weights as I run up to a holiday depending on whether it's a beach holiday or not. I was 242lbs and reasonably lean when I got back from Egypt in Dec last year but I'm down to around 232lbs now. I'm 6'3" with a 44" chest and 34" waist (trying to get to 32") I have long arms hence the frequency of training them. In my avatar photo I was circa 217lbs but very lean and was before a beach holiday.
If work is busy I might only train 3-4 times a week. But work tends to be quite physical so I'm getting a workout whilst working. During the winter I tend to gain weight, eating higher carbs but summer I'll cut the carbs or intermittent fasting.