This may just be the most agonizing part of graphic-noveling, when you're so close yet still so far. When you have an allotment of pages that are: penciled, inked, and lettered, ostensibly completely finished pages, exceeeeeept not quite. For this particular chapter I'm working on, the pages require a final sweep of touchups, halftones in some cases, and colors in others (sometimes a single tone of color, or two tones, or “full-color”, which in my case I have limited to 4 tones). The fact that each set of pages requires a different process to be brought to the finish line, means the amount of time each page requires is quite different, which makes it significantly hard to accurately assess the amount of time each page needs to finally be done-done. Which is frustrating.
New computer has arrived though and I'm finding that it is already helping speed up the process.
Prison Chart system: back-slashes for pencils, forward-slashes for inks, strike-through for letters, and then finally a blackout for pages that are done-done (like I said, some require various degrees of color and some don't).