Good Lord! Cant believe you left it out of the fridge

let alone eat it afterwards
Eggs and Chicken are some of the worst foods to mess around with. Salmonella and all other types of wonderful bugs to mess with your stomach
The Mayo will last quite well in the fridge, preservatives and the like will mean it will last awhile. I personally wouldnt keep it opened (and in the fridge) for more than a month.
Not sure about mustards, but I keep mine on the fridge for quite awhile - as I dont use much at a time.
When it comes time for you to experiment with Shell foods (muscles, etc) - make sure you come back on here for some advice - as seafood poisoning is not nice