Well sure, that's why I said it would take a little longer. But if you soak the prints for, say, 10 minutes, THEN wash, it seems to me this would be just as effective as washing at the time.
At least, I hope so. It never occurred to me before and most of my prints are in fact, soaked/rinsed somewhat then left to finish washing later, because I usually finish a darkroom session way too late and too tired to wash them then.
Oh, and I never use hardening fix for prints. Or at least, almost never - I keep powdered Kodak fixer around along with a pack of D76 and one of Dektol or similar, in case I run out of my usual stuff. If I should run out of Rapid Fix I'd use that, but I've never let that happen.