Isotopes are atoms of the same element (that is, with the same number of protons in their atomic nucleus), but having different numbers of neutrons. Most (66 of 94) naturally occurring elements have more than one stable isotope. Thus, for example, there are three main isotopes of carbon.
According to Nestle, the parent company of Hot Pockets, a frozen Hot Pockets Cheeseburger sandwich should cook for 2 minutes in a 1100 watt microwave oven. A refrigerated sandwich cooks for 1 minute. In a 700 watt microwave oven, a frozen Hot Pockets Cheeseburger sandwich cooks for 2 minutes 15 seconds.
If you are using a convection oven, a 1/4-pound Hot Pocket will need to bake for approximately 12 minutes and a 1/2-pound Hot Pocket will need to bake for about 15 minutes. As the package-recommended cooking time approaches, check on the Hot Pocket to see if it is fully cooked.