I also do kind of a mix. Also traditional artist, working with ink and Markers. The sketch-lines I do pretty much, whenever I like (mostly, when I should go to bed x,D ). The rest I do as batches à 4-6 Pages (mostly who are in the same color-sceme). This especially helps when coloring, as I have the right markers directly in my hand and don't have to change them every-time. Like, when I'm doing my charas hair I have the correct tones in my left hand and then draw the hair in all of the prepared pages. This safed me alot of time. Also I don't have to remember, which of my x-brown tones I used for this random background-object nobody cares about anyways...
The other good thing I figured out: I have to finalice every page of the badge. For example: before that, I was sometimes stuck in doing mini-corrections, wait as I didn't feel comfortable etc. Now it kinda forces me to get my butt up and finish it xD
But in the end it depends on every artist itself. I haven't done my pages batchwise until very recent and for me, it works out.