We're not draining a 300 gallon tank through a 1/4" hole. Remove drain plug, as its draining remove the filter. Install new filter. I guarantee by the time you've done that, you're down to a couple of ounces, if that, left that may drip out. Ten minutes in, once the new filter is on, I'm getting a drop every several seconds. Drain plus goes back in, wipe it off so it doesn't drip on the shop floor, stand up and start pouring in oil.Apparently a "filter only" guy. I like to drain the old oil and put in fresh once in awhile, too.
Waiting a half an hour for a couple of ounces of oil to drip out is silly.