Does the 1996 Honda Passport have a timing belt or timing chain. If it is a chain, does it need to be replaced at 100K?

Belt

More than likely, it has a belt. They last about 50000 to 65000 miles. some last longer.

Honda element has a Timing Chain, and Honda doesn't even recommending looking at it till something like 110,000 or 120,000 miles.
However, it is this an "interference" engine, meaning that if the chain or belt fails it could destroy the valve train and even the pistons.
Because it is an interference engine. I plan to change my chain at 100K, since I expect the car to go at least 200K but don't expect the chain to last that long.
Normally cars has Tune ups scheduled at 30K, 60, and 90K. As the rule of the thumb at 90K Tune up mechanic shops recommend timing Belt or Chain to be replaced. We can go for longer taking the risk.

Chain. It doesn't need replaced unless it has a problem. Chains don't have a service replacement interval.

you should be good thats normal to replace drive belt around 100k

It has a timing BELT. I just had mine replaced ($600). After well over 100k. It was barely worn so go to the effort/expense of checking before you go whole hog on a replacement. Also the V6 3.4 litre is a NON interference engine.

There is no timing belt on this vehicle. Vehicle was produced with a timing chain which generally does not need service through the normal lifespan of the vehicle.

Belt is better replace either about every 100.000 or you'll destroy the engine when it goes out

Belt is Better because it's easier to replace, therefore much cheaper

Chain is inside and in the oil bath so harder= more expensive

By the way. dealer says replace every 60K . 100K is a MAXIMUM

Get a Haynes or Chilton repair manual for you vehicle.

try autozone.com they have a repair section with manuals online.