I must have been ludicrously over-washing prints all of my life. Residual hypo test came up clean today after a 15 minute wash...and that was without a wash aid. I was just running through some min time to max black and film speed test stuff....but got curious about the hypo and tested.
That was 15 minutes in a Zonve VI archival washer running at 1/2 gpm. The prints had been is a gently running water bath between the 2nd fix and the washer.