Originally Posted by
pitchattitude
I think it works out to seven 30 day months and five 31 day months (except leap year with six and six) but it does tend to affect the averages.
Specifically, if the average is four hours per day, a thirty one day month will average 4 extra hours or one extra day off.
I get that it effects the averages. Just pointing out 30 day months are more normal than not. It's not an aberration. If anything, the 31 day months are the non-normal.