A meal should not be re-heated more than once.
Generally, it is recommended that leftover foods be reheated only once.
Most food safety people would recommend re-heating food only once and it should be heated to 165°F (hot and steamy) to kill any pathogens that may have started to grow during storage or that might have arrived through contamination.
At all times during operation of the aircraft.
Castles were heated using fire places.
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As many times as it can, as long as it remains airworthy. Small Cessna aircraft are often used as primary trainer aircraft and as such, they can land and take off again several times per hour.
Yes, at all times that it is traveling supersonic.
Chicken soup can be reheated several times before it goes bad. As long as the chicken soup is properly refrigerated afterwards, it can be kept for up to seven days.
no limit
Meat can be reheated several times but it is recommended to be reheated once. However, each time it is reheated bacteria will grow, and should be reheated at 165 degrees or higher to kill most of the bacteria.
mostly mixed with copper and heated to make brass
To avoid overheating and explosions.