There is no such thing as a standard warranty.
You might get "bumper to bumper" on a nearly new low miles car, all the way down to 1 month engine and gearbox, or possibly none at all.
Timing belts, turbos, clutch, tyres, brakes and suspension are all service parts generally.
You should have asked at the time of purchase was any major work due on the engine. Timing belts lives vary car to car, and the dealer is obliged to tell you. Purchase more carefully next time out.