Took My side cover off today, 10k miles 16.3 mm extension, guess I need to talk to Versy. What is normal for 10k miles, anybody know?

Also has anybody taken off their exhaust and not found the copper gasket. I find it hard to believe that Suzuki failed to fit one but nobody has touched the bike since it left the dealer. Murphy has played tricks on me but that gasket is pretty big to lose???

depends on how you ride, if you ride like youzguyz then it would be half done.
a very conservative estimate is 1000 miles per mm.

the gasket get mashed, it may be there just hard to see.

I don't really think there is a normal. There seems to be a lot of variation. I checked the gf's CTT at about 10k kms and it had about 6mm left but it's pretty well not budged the last two times I've checked, at 36k kms it still had about 5mm left, so I put on a Versy anyway and left it on the first notch, so I don't have to worry. It's at 41k kms and it still sounds normal, but I'll be pulling it off at 42k kms and I would not be surprised if it's still got something left.

With regards to the gasket, it's not copper it's an aluminium crush gasket, you'll need to get a little hook from an autorparts store to make it easy to get at. Believe me it's the best $3 you'll spend. Try to dig the point of the tool into the middle of the gasket so as not to scratch the mating surface of the engine. It will all be blackened so use a strong torch to see where the edges are.