It kind of depends for me. Usually in terms of actual elapsed hours spent, probably between 4 and 8 per strip depending on complexity.
In terms of actual elapsed days to get a strip done, usually three or four. A 9-5 job wrangling with 12 year-old computer code and oracle databases usually somewhat kills my muse.
I usually need about 2 hours just to get sorted around the house and get my brain back on a weeknight, so I can usually only squeeze in an hour or two then.
I love the weekends because I get a chance to work uninterupted with some actual cogent thought processes
