itz not so bad- if you have the chance, do the swims when others are also doing them - that way you are able to push each other (do the treading water early on as usually this is the easiest for most people - and takes some pressure off you in regards to getting the required points)I can swim for hours - just not fast.
- and finally, remember, you do not need to do them all in one evening e,g. do the 400m and tread one night and 800m and 100m tow a differernt night or even 2 different nights - I found the last 2 by far the toughest in terms of the effort required.