My 1150 has tourance on front and rear and is driven quite hard, I also tend to brake quite hard and late.
Both front and rear were both brand put on at the same time and cirrently have about 5k miles on them, and I think I will get another 3k or so out of them.
I think they will both be due to be changed at the same time as there isnt a great deal of tread left on the front and its getting scalloped from braking hard.
steve