I've eat 1 -2 days old sandwiches of peanut butter and a lot of other things (ham, chiken, chocolate, cheese...) without problems ;) 15-20 hours is not too much. I think, only raw eeg could be unsafe.
Part of the Smart grid glossary: The International Telecommunication Union (ITU) is an agency of the United Nations (UN) whose purpose is to coordinate telecommunication operations and services throughout the world. Originally founded in 1865, as the International Telegraph Union, the ITU is the oldest existing international organization.
Established in 1964, the International Trade Centre (ITC) is the joint agency of the World Trade Organization and the United Nations. ITC Mission ITC's mission is to foster inclusive and sustainable economic development, and contribute to achieving the United Nations Global Goals for Sustainable Development.