15-20 mins, sometimes less if I'm whooped, longer if it's a small crew. I'd rather do a bunch of 10-15 min sets than a few 20-30 min sets. A few years back I'd do 40+ min sets since I rarely got out and often was the only one riding. That was rough, could hardly crawl back in the boat. 15-20 min sets with 4 riders seems about ideal to get 3-4 sets in and have enough time to rest between.
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