This session showed a data error on the Garmin Swim which makes me wonder about the accuracy of all of my previous swims! One set was recorded with a total time of just under 15 minutes and yet adding up the individual lengths it was closer to 18 minutes. Oddly, the watch knows that this is the case as the average pace of that set is shown correctly. The 'missing' time seems to have been allocated excessively to a 'rest' as there is now way that I stopped for over 2 minutes, in the same way that 800m in less than 15 minutes isn't going to happen in the next day or so.
On a more positive note I did manage 6 lengths at a pace better than 2:00min/100m and I didn't fade as much as I have previously at the end of the session.
Looking back it's great that today I managed all three 800m sets in under 18 minutes, corresponding to less than 9 minutes for 400m. This is distance for the time trials I've been doing and 1 year ago in August 2015 my time was 9:07 minutes. Today, in my final set, I beat that having already swum 2000m.