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Just to say that in another experiment elsewhere I was on the treaddie for 90 mins + 5K, which in the end equated to about a half marathon. It was not a major problem in terms of boredom, but we did have to keep jumping off to give samples which made it slightly more intersting. There were 5 sessions to do of this. I would never consider running for that long on a treadmill normally! 

Hope Steve has a good selection of bad jokes to tell...

If you leave it wet, or leave one electrode plugged in, very little time, less than two months.

About 6 months was normal for me. Much less than the advertised time.

Flat Foo.ted wrote (see)

Question - can you use a bivvy bag and poncho instead of a tent? Surely this will save a bit of weight?

I had a bivvy bag for a number of years and its not really much lighter than a modern tent, but with all the disadvantages of a bivvy. In competitions you are not allowed the bivvy poncho combination either, so its not a starter if you have any inclinations that way. 

I use the standard TN laser for the advantage of the second zip - escape in the night for a pee is much easier when you have the second one! The weight penalty for this is about 200g, which I am happy with...

I have been fine with a 300g of down bag in summer and autumn, but the 550g fill bag has been fine in winter in lowland locations.

Its a simple acceleromter, not a pedometer. It measures more than  just number of strides.

Your GPS is probably more accurate, but may still be out.