No way to say, there are multiple variables involved.
Chamber dimensions, brass quality, powder and charge being used, and how much, and how often the shoulders need bumping are all variables.
Bottle neck brass must be maintained to within SAAMI trim too length. This is something that needs to be checked each time the brass is resized. I use the inexpensive ($15) Lee trimming set up. Case length gauge, cutter stud, and shell holder. I put the shell holder stud in the cordless drill, each piece of brass gets passed through the case length gauge, if it trims, it needed it, if it doesn't, well...
FL sizing will eventually be necessary, as shoulders or other dimensional characteristics will need some maintenance in order to facilitate chamber fit. So plan in buying a FL die, you will need one.
I don't anneal my brass, but if done correctly, it will help reduce premature neck splits, done incorrectly and....
So to sum it all up, if you do everything when necessary, don't over do anything thing, and run low pressure loads, from an average chamber, you might get 15 loads, you might get 30 loads, it just really depends on the variables. In most instances, the brass will either fail due to case head separation, neck splits, or primer pocket expansion.
My biggest brass eater is a Rem. 700 chambered in 7mm RM, and I get an average of 12 - 15 loads from my brass. I've had brass that has only lasted for 7 or 8 loads, some that has gone 17 or 18 loads also.
GS