"Accessory" engine belt replacement?

[HMercerCo@aol.com]

I used to call it the "fan belt", but I don't know what to call these new
all-in-one grooved jobs...

Anyway, my 95 VR6 is approaching 70K and the belt driving the alternator,
etc. is starting to look a bit cracked.  What is the recommended change
interval, how much is the belt, and how difficult is it to change (special
tools/time required?).

Any insight would be appreciated.

- -Steve Mercer