6 to 8 hours...I think. I never timed myself.
A complex background increases that by about an hour or 2 (sometimes even 4).
If I am drawing a page with 3 panels instead of the usual 6, decreases that by an hour or 2.
Panels with just one character in a medium shot are the quickest to draw. If a page has several of those, they usually are done faster. The more character per panel, the longer it takes. Children are faster to draw than the adults.