Serpentine Belt Replacement

My serpentine belt looks fine -- no cracks, no glazing, no frayed cords -- but I'm coming up on 50k miles and think it should be replaced. A couple questions:

1) Is there a replacement mileage interval for this part?
2) Is it hard to remove/replace?

I've done this before on another vehicle but it had more room to access the pulleys than there is on my Taco. Thx in advance.

 

on the 4 cyl gen2 i think its around 100k, but as always , if it were cracked etc replace it
owners manual will show a spefic interval for your vehicle

 

I replaced mine at 75 or 80k because it was beginning to squeak when cold. It's not hard, just need a socket (14mm I think) and a ratchet or breaker bar so you can move the tensioner off the belt.

 

I checked the OEM service manual before posting here, it only says to inspect the drive belt at 60k, 75k, 90k, 105k and 120k miles. The manual never recommends replacement of the drive belt(s). I find this strange, but then different driving habits, road types, environmental conditions, etc. all affect the life of the belt and everything else for that matter. I'll just inspect it periodically per the manual. If it gets up there near 70-80k, it's a $40 part and I will replace it for my own peace of mind. Thanks for your replies.