How long will mousse keep?

I made some great chocolate mousse from a Cook's Illustrated recipe yesterday. We ate about half and didn't get sick, so I'm assuming the eggs were fine to start with. The recipe says it will keep in the refrigerator up to 24 hours- is this a food safety issue, or is it just that it won't be as fluffy after that time period? We want to finish our mousse, but not if it will harm us!|||It's not so much a safety issue as it is a texture issue. The mousse can start to lose it's texture becoming more dense (as well as pick up other odors from the fridge). You shouldn't let it go further than 2 days, though.