There is someone over at ih8mud that had 180K on his orignal t-belt! really WAY to far IMOP but 100-120k really should be fine
when I did my 2000 LC at 90K, I did the belt, waterpump, tensioners, crank/cam seals and some other stuff.........all for under 1K. the t-belt looked like new.
glad I did the waterpump as it was just starting to leak at the shaft and the weep hole, pump was around $100.........money well spent IMOP
John