I have asked this question of the dealer, twice now. The answer is that it should last for the life of the engine. If you had an older Toyota, like I did, with a timing belt, it had to be changed at an interval recommended by Toyota. No such interval exists for chains, according to my dealer.
The 2006 Toyota RAV4 4cyl has a timing chain.
timing CHAIN
The 4.0 liter V6 engine in a 2006 Toyota Tundra has a timing CHAIN
The 4.0 litre V6 engine in a 2006 Toyota Tundra has a timing CHAIN
Yes , it has a timing CHAIN
The 4.0 liter V6 engine in a 2006 Toyota Tacoma has a timing CHAIN
Yes , the 2.4 litre four cylinder engine in a 2006 Toyota Camry has a timing CHAIN
Normall it will last the life of the engine and is changed when the engine is overhauled.
It must have a timing CHAIN , the Gates website does not list a timing belt for the 2006 Toyota Tacoma 4.0 liter V6
Chain.
Chain
It has a timing belt. Only 2007 & newer Sienna have a timing chain.