Roxy Chick
The SOs do about 3 to 4 trips a month, each pattern being 3-4 days on average. There are off course exceptions to this rule. 777 guys may only get a couple of New Yorks and an airbus guy might get a long layover in Paris. Swings and roundabouts in the end really. Overall, lots of time off.
However...given the title of this thread and reading between the lines (dangerous I know) I get the feeling you are thinking about commuting. The problem there is not lack of time, but lack of money. Without the expat housing allowance or somewhere to stay for free in Hong Kong ie family, rich dad or whatever, you will be hardpressed to afford commuting from anywhere.