I don't work anything remotely resembling fixed hours, and for several reasons :-
1) I'm the boss, so I work when I want, for how long I want, doing what I want, and I do it where I want. A lot of the time, that's either at home or visiting clients (and that's a worldwide proposition).
2) I'm semi-retired (though sometimes I wonder how semi that is
![Frown :( :(](/styles/default/xenforo/vbSmilies/Normal/frown.gif)
). I don't typically do full days any more, or even regular days. I may spend several days on a project, then not see the office for weeks. Other projects may take months to put together, but I only provide oversight, strategic guidance and a watchful eye, so they get a day here, day there, or a few hours a week.
3) There are still some projects that need my involvement, usually if the client demands that and nothing short of that. On occasion, this requires a few days of long and intense hours - several days of 18-hour days has been known. But, by 'eck, does the client pay for it if that's what they want. If they put me through that, do they bleed for it!
![Big Grin :D :D](/styles/default/xenforo/vbSmilies/Normal/biggrin.gif)