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I normally swim 2-2.5km per session about 3 times/week. I reckon on an average of 30 secs (or just under) per 25m, or 40 mins for 2k. Not usually breathless after that so I would consider that light/moderate. I would consider fast as an average of say 22 secs/length or sub 30mins for 2k combined with a level of physical…