To VPI TT users, please provide your experience

Having just recently, 2 weeks ago, aquired a upgraded Prime Scout ( 10.5i tonearm, classic 20lb platter, VTA base) I'm wondering how long the drive belt is useable. I actually use it 3 to 4 hours daily on average letting the music take me away.
With such I assume to be heavy useage I'm concerned that I would be best off by having a spare belt available. At what time should I start looking and where can I purchase a spare?
Your insights and knowledge are always helpful. Thanks