This really depends since I started to work more with panels than with pages. I do long strips now that could count for 1-3 pages in one go.

Page-wise, I can do 1-2 in one day, depending on how detailed it is. If it's simple details, 2 pages in one day. If it's heavy on details, it's one page in 2 days, tops.
Panel-wise, I can bank out 17 in a day, not including speech bubbles. Again, depending on how detailed.
If it's simple, 17 and up. Heavy on details? Around 6-9.