Swimming 6

I have had to come up with a sequence of swimming titles. This is the sixth day I have been swimming since last Wednesday so its swimming entry six. I hope that clear ;-)

21 lengths in under 20 minutes. Don’t know exact time ‘cause my stopwatch flaked out and i didn't have my glasses on, so therefore couldn't see the clock, not that I checked the time going in, but I got out the pool at 1740.