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Put them in a paper bag if you're going to put them in the fridge. The type of bag you get at the green grocers. Some supermarkets, like Tesco, have little paper mushroom bags that you can grab a few of.
The paper stops them sweating and going all slimey.
They should keep a few days, but it depends on the condition when you put them in. If you intend to keep them longer i would leave them out in a warm place on some paper towels and let them dry out completely.