I row every day without exception for ~40 minutes at a rate of around 800-900kcal/hr. 2 hours seems excessive. You can trade intensity for time. It will suck a

I row every day without exception for ~40 minutes at a rate of around 800-900kcal/hr. 2 hours seems excessive. You can trade intensity for time. It will suck a lot more, but that's kind of the point. The best way to build power on the rower is to do HIIT. Pulling at 1400kcal/hr for a solid minute will awaken something inside of you. I'd start with 30s sprint, 60s recovery. The idea is to try to break the chain during the sprint. A C2 rower can handle anything if that's what you're using. There's no way you could hurt that machine. I'd encourage you to try.