The US gets a very similar lineup to Canada.
Anyway, I've heard of the timing chains going as early as 50,000 miles. They're a rather flimsy system. And, when they go, pistons crash into valves. Repairing the engine at that point is more expensive than replacing it with a good used one.
(One general rule with VW is never get one with a timing chain, because they suck at chains.)
Best preventative maintenance for the timing chain is to run the correct oil (I'm guessing it'll be a synthetic meeting VW's 502.00 standard, maybe 504.00), and change it out at the correct interval (usually on VWs, at 5,000, 10,000, and every 10,000 miles thereafter).