The longer the fibre print is in the fixer, the more of it soaks in to the paper and has to be washed out. The bit of the paper that needs the fixer is only the very thin emulsion after all, so the Ilford archival recommendation is film-strength rapid-fixer for a surprisingly short time - one minute - and that can still be using two trays of fixer if one is quick, followed by a 5m wash, 10m in washaid and a final 5m wash. All temperatures at, or very near, 20C.

At what point you might try to put the paper in a holding bath is a good question - after the washaid perhaps? Thinking about it, I seem to have a slightly longer first wash while I make a second version of the print, then proceed with pairs of prints from there.