The small packets of mayo (as well as mustard, salad dressings, etc.) are all shelf-stable and never need to be refrigerated when unopened.
Thus, the bacteria count will double in about 0.75 hours.
The FDA recommends that all perishables left at room temperature for more than two hours be discarded. Bacteria grow most rapidly between 40 degrees Fahrenheit (4.4 degrees Celsius) and 140 degrees Fahrenheit (60 degrees Celsius), doubling in amount every 20 minutes.
1 Answer. Cactus must be placed in sand, and not adjacent to another block. Diagonally adjacent is okay. It will grow even in complete darkness, and does not need water.