It' be interested to get some advice on this approach for prints. I print in the bathroom, so fixed prints go into the bath. This is usually about half full, and gets topped up, and partially drained a few times during a long session. At the end of the session, the prints generally get left in for a few hours, with a few changes of water as and when I remember (along with a final rinse under the tap!).

It all seems to work fine - I figure it's so dilute by then it should be ok, but I should probably adopt a more rigourous procedure, so any advice out be appreciated.