How long can ham sandwich stay at room temp?

Answer 1

That depends on many conditions. Assuming a constant room temperature of 70 degrees F (just for example purpose)

The humidity level can make a big difference. The higher the humidity, the easier it is for most microbes to spread and multiply.

Cleanliness of the surface the sandwich is on makes a huge difference. If the surface is sterilized, few microbes will be on the surface to transfer to the sandwich. while if the surface has been wiped with a dry cloth it'll make almost no difference from not being cleaned at all.

There are too many variables to give a full list, but in general, if the sandwich has warmed/cooled to room temperature, microbes have begun to multiply, and it won't take long for it to be dangerous to eat.

Answer 2

You should keep foods out of the danger zone to prevent bacteria from forming on foods. Bacteria can form on foods in the danger zone after just an hour. The danger zone is under 145 degrees and over 45 degrees.

Answer 3

Potentially hazardous food should not be left unrefrigerated for more than 2 hours. Less time is better.