So I rowed again. The first time for a long long time. I aimed to complete 30 minutes, and it felt like a long long time. It was actually a little over 6,000m in 30 minutes at about 2:25 (ouch!).
I then cycled for 30 minutes, which because of the weird creaking from the pedals, felt like a long time.
But it is done. An hour flies past on a road bike on the road. Go figure.