How long a chain will last depends on your maintenance !
I did 32000 miles on a crf1000 africa twin and 21000 miles on a yamaha t700
Both bikes had very little wear on the chain or rear sprocket ( i did replace front sprockets before they became worn )
I allways carry 2 small plastic bottles , you get in hotels and fill them will oil and keep the chain very well oiled,
The only drawback is you get an oily swing arm . and the bike runs smoother !
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