Good for you Ski! You have done really well, and swimming in cold water isnt easy, and you have come so far!
OH and I went to pool last night and had a lane to ourselves for most of it, then someone got in..
Bless him he put in a blistering 50m to show us he could.. but then couldn't sustain it and had to rest, while we just pushed off and kept going. 
He was a good swimmer, just out of condition, and we were on a mission to be ready for the return to Masters on Sunday. We did about 90 mins and came out with 2.5k with 300m of that kick drills with fins
Overall, I've improved my stamina over the summer, thanks to all the long course swimming I've been doing here and there. Last night for the first time ever I was able to do a straight 400m FC warm up with no stops. this is the standard start from our coach, so I know come Sunday, she will start off with that, and this time I'll do it without the pause for a couple of gulps of air halfway through.
I know my speed may have slipped a bit, but I've worked on strength overall, and a lot of leg strength too. I know she'll have us racing and dying working on speed, but what she doesn't get to work on are endurance and distance.
In a good swimming place. bring it on :D