Wow, neat to hear from other artists, I've always been curious how long it takes other people!
For my Everwake series...
To actually finish the art on pages it usually takes me about a day, I don't count my hours exactly, but I'd guess around 5-6 hours for most pages. I have two styles I use though too, my more basic coloring...
and more complex...
This is just for creating the pages though, I always have to go and re-edit the writing and how the story fits together, where the art goes, where the comic parts go. My comic/novel style though in general is different than anything I've seen online, and only a few times in bookstores with the mix of comic + novel.