It is believed that half the Byzantine Empire was destroyed in the 6th century, a total of 100 million deaths. Such large fluctuations in population size over long periods greatly compound the difficulty of estimating the number of people who have ever lived. By 1800, however, world population had passed the 1 billion mark, and it has continued to grow since then to the current 7 billion.
There are many steps during the process of preparing and serving food in which time and temperature must be controlled. Harmful microorganisms grow well in foods held between temperatures of 41 degrees Fahrenheit and 135 degrees Fahrenheit. This temperature range is also known as the Temperature Danger Zone (TDZ). The less time foods spend in the TDZ, the less time harmful microorganisms have to grow.
How long can you hold hot food? The key is in how long the food has been kept in the danger zone between 40-140 degrees Fahrenheit. Combined, the total time that food is allowed to be in this zone is 4 houâ¦rs. This includes prep, heating, cooling, and reheating times.