Gee, I need to get from point A, to point B, but my tires are new, and I don't want to get them dirty.
:)
Use the hydrometer/ refractometer, and rinse it after each use, and before putting it away rinse it a bit better and dry it.
When Amps stop tapering at absorption voltage, and start rising, call em done, is another method.
Or are you afraid of wearing out the spring on your DC Clampmeter's clamp?
I've had the absorption stage take 4 hours and I've had it take 14 hours, and I certainly wont be venturing a guess on your batteries.
