when to change deck belt
just wondering when is the time to change the deck belt on my 2010 zmaster 48. it's got 350 hours on it, was gonna pick up a belt just to have as a spare but they're almost $100. no indication of problem yet, but never had a ztr before this one (i bought it new). so far i've only changed the filters and oils. it's been a great machine. also, how many hours are you guys getting out of blades. i'm on my 5th set of blades so i guess they're lasting 90 hours per set (sharpened maybe 4 times, now they're all shot).