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Some suppressors use rubber "wipes" that wear out after a few uses. Metal cans using baffle chambers don't physically contact the bullet unless things go wrong, so the only wear is pressure stress. They last a long time. Those that are easier to disassemble, clean, and generally maintain will last longer if properly cared for, of course.

I asked a pro and he said yes they do wear put but definitely not quickly. Depends on the material though.