As of late I try to put in one hour a day. Sometimes I can squeeze in more time... but owning my own company makes it unrealistic to do much more.

Even in a day off though I find I can't sit down all day and make music. After about 2 hours my ears are starting to fade and after 4hours I'm num. At that point its time to pack it in. The next day I can pick out all the things I could not hear within the first 5 minutes and a fresh pair of ears.

1 hours=fun
2 hours=productive
4 hours=work
8 hours=a career... you better be making some $