With modern bowling balls there are two things going on. One is oil soaking into the cover stock. Obviously how much gets absorbed depends on what the cover stock is made of and how well the bowler takes care of wiping it off and cleaning it.
The other is the abrasion of the ball surface by the lane. Some one posted some thing about how fast this friction changes the surface of the ball. Again this will vary due to the lane surface, the ball cover stock, the bowler's rev rate, etc. It struck me as pretty amazing how fast the ball surface can change.
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