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.
The International Telecommunications Union (ITU) (formerly known as the CCITT), coordinates the development of the actual SDH standards. It is financed by the United Nations and coordinates the development of telecom standards for the whole world. Below are the most important SDH standards available from ITU.