How long will a 3060ti last?

I can say with confidence that it will definitely last for 6 years or more if your target is at high, 1080p, and 60fps. The RTX 3060 Ti can play most AAA games on ultra, 1080p, and still get > 140fps. If you will be staying with 1080p, and only aiming for 60fps, I’d say it’s a damn good card.