Last year around this time I was drawing 5 or 6 pages ahead of the most recent update for my comic. I was able to have a few weeks where i would do a second update for the week. After ending that chapter and beginning the current one, work got really hectic and tiring, causing me to lose my buffer. So currently I'm, at most, 2 pages ahead, and plan to draw a majority(if not all ) of the next chapter before beginning to upload it.
That said I've yet to miss an update, so yay for that. ^_^