It was quite an adventure. The distance wasn't too bad. What really wrecked us was the cold February weather and the last 50ish kilometers with roughly 500m elevation gain. About 40km of climbing, (although most of it was just false flats there was a short climb that maxed out at ~20% and a 15km climb at 5-11% gradient), followed by a 10km descent where I crashed on ice, in the dark (I got really lucky!).
I have another 200km ride planned for late August (two days: first day ~160km, second day ~210km), not quite as long and I'm on a much faster bike now, but 200km is still a lot! Hopefully the weather plays along this time.