Prayers that I use frequently (just for protection) and OSRS gold is completely wiped out prayer until it is 0 within a minuite or 2. I have my prayers flashed to protect (on just b4 opp atks to be removed shortly after) With two prayer pots, it could last well past the amount of time required for me to have full inv. It can be as long as.
The downside is, because of lag, even it fails from time to moment, and I get hit. If I don't have a good def, a few seconds of lag could mean the loss of half my savings lol.