What is suggested interval for timing belt replacement? No info in Srvice manual

2wd,4wd,2.7L,3.3L hybird,3.5L gas?

you have a timing chain only service if noisy

If you have a Hybrid Highlander, you have a timing belt. Toyota recommends replacing the belt ant 90,000 miles. If it's not a hydrid, you have a timing chain. Toyota has no recommendation for replacement. It is not considered a wear item.