I agree with the above. If you shoot a lot then you would want to change strings more often. If you are only using it for hunting and practice before the season than it should last much longer.
Keep it waxed, but don't overdue it and keep a good eye on the serving for fray and seperation.
In my target bow I will change strings 2 to 3 tiumes a year. On my hunting bow maybe once a year if it needs it. I also build my own strings so changing them is no problem for me.