The main thing that used to hold me back from getting a lot of film done in one day was that it took too long for the reels to dry. Residue from the previous round of processing was messing up the edges of my negatives, and sometimes intruded into the frames themselves. However- I solved this by first drying them with a clean towel, and then set them to dry under the stove fan atop a tower built of darkroom chemistry trays.
With his method, he was able to process 22 rolls of black & white negative in one day, ready for enlargement and/or scanning. Impressive, now I’m feeling nostalgic.