I was reading about the soaking method of washing prints.
Here's the link where I read this:
Anthony Guidice (Fine Art Photo Supply) advocates one exchange of water during a one hour and fifteen minute soak. That is how much time he says is needed to wash a print to archival standards. Shorter times can be used if you use an alkaline fixer. He used HT-2 to verify that the prints were washed (soaked) adequately.