The Dead Sea got its name not because you can float like a dead person, but because the salinity is so high that no form of life exists in the water. And when you look out to the other side where Israel is, you can really see the 'dead calm'. So 10-15 minutes in the water was good enough for me!.. The salt causes a really weird "under your skin" feeling but I must say, that whatever other minerals are in the sea, they worked wonders in keeping my hair from curling.. Lol.
Cold at first... But then all good!