On my 883 its about 10-15
I know because I do at least 1 set every 8-10 months
will have a look at night dragons.
I've got 24k on my front Slim S stock tyre. Got 16k out of the first back one, then about 5k on the second due to the rubber suddenly flying off one night at a bike show (not sure how that happened). From what I see the Slim tyres should get roughly 16-20k depending on how ham fisted you are.
About 24,000 on standard Michelins on a 1200.
Im relativity new the the cruiser scene still on my first set of tyres on an 2016 Low Rider, but Im really surprised at the tire life. I only have 5000kms on the bike but they are no where near showing any signs of wear. On my other bikes Ive had, sport tourer's and currently have a VFR 800 Im lucky to get 6-8000kms out of a set of multi compound tyres. I was expecting to get less due to the weight of the HD, however the standard Dunlops dont give me a great deal of confidence especially in the wet. My next set will be as soft and grippy as possible, dont really care if they only last 10000kms, a set of tyres is cheap if it stops me from having a slide in the wet.