how many k's should I get out of a 1200 evo ?

I ride reasonably hard

Based on what I've read on US forums, Some have done 100,000km before a top end rebuild.

Take the number of K's the back wheel has done and subtract from that the number of K's the front wheel has done, divide the result by the number of burn-outs you've done. 

If all of the burn-outs have resulted in tyre pops then multiply the reslt by a factor of  ten,

If no tyre pops resulted then multiply the result by a factor of fifty,

If no burn-outs or tyre pops, then safely assume she'll still be pulling the plough at around 100K K's so long as you service her properly.