Any rules of thumb on 'approximate' same grit usage?
Based on the experienced users best observations.
Once and throw the pad out (as far as sanding purposes 'at grit')?
Twice, three times..??
Thanks

scotch-brite: i'd say 3-4 usage depending on grit and pressure used.
rougher ones last slightly longer.

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"...for advice is a dangerous gift, even from the wise to the wise...."
J. R. R. Tolkien

Thanks for the inputs.
Realized that it would be a quessing game at best.
Thru my experience I've been inclined to utilize either type of pads for 3-4 usages tops.

My rule of thumb has been one usage for my 'goto' balls. Then that pads next 2-3 usages are strickly for the rest of my equipment (or for my family and friends..).
At times, I've even doubted the 'correctness' of grit with an original pad after the first 'side' or two. If I could, I would use a fresh pad/or pad side for each 'side' of the ball sanding, but my wife would not appreciate it.

So, just like reading the lanes, when in doubt I thought it is wise to have another's experienced input.
I thank you very much for your time.