I finally took photos of the process! (I should have scanned each step for better image quality, but that's a lot of work...) Here's a panel from an upcoming page, and all the stages I go through.
Step 1: Rough Pencils
This is the step where I draw out my panel margins, roughly place figures, figure out poses, and place word bubbles. I ink word bubbles and panel margins at this stage so I don't have to worry about them while I'm drawing my figures. This takes me 1-2 hours, depending on the page.
Step 2: Finished Pencils
This is the step where I actually chisel out the details of the figure, especially those details I don't trust myself to freehand with ink. (Like faces. I never free-ink a face. That never goes well.) This can take me 2-4 hours depending on the page, and I almost never do this on the same day as the rough pencils-- it's just too much to do all at once. I really need to be able to sit down and commit a big chunk of undisturbed time to this step.
Step 3: Ink Lines
Then I go over my finished pencil lines with ink (Micron pens, in my case). I will do some work with line weight here, but I don't go too crazy with it, because I'll just have to re-ink these lines later. I do drop in some texture details that I can safely freehand at this stage, like the dirt, rocks, or simple vegetation. This step takes me 1-2 hours depending on the page. Sometimes I do this on the same day as the final pencils, but only rarely.
Step 4: Color
After I ink, I erase my pencil lines and settle in to color, using a combination of Prismacolor and Copic markers, and occasionally some colored Micron fineliners for details too small for my markers. (Forgive the color on this stage, this is a photo I took on my phone and attempted to correct in Photoshop-- it's not a good example of what the color actually looks like at this stage.) This step can take me 6 hours or more to do a whole page, and I often have to break up coloring sessions across multiple days. On average, it takes me 2-3 days to color a page, in time chunks of 2-4 hours.
Step 5: Re-ink and Finish
This is actually a few steps rolled into one, but the re-inking is one of the most important parts here-- I go over my lines again, darkening them and adjusting line width and hiding spots where I overshot my lines with the markers. I also actually fill in the pupils of the eyes at this stage. Re-inking usually takes me about an hour or so.
After this, I scan, piece the page together (because I can't scan it all as one piece-- the page is too big for my scanner!), color-correct, clean up errors, erase the hand-written text and put in the font text, darken the panel gutters, and make it all finished and pretty! This part of the process usually takes me about another half-hour to hour, depending on the page.
On average, from blank page to scanned and finished, this takes me 5-7 days.