Well the real answer is they're actually arbitrary. Different toasters work in different ways. Some work under a timer system (usually the older ones). However, due to the expense of a timing mechanism, and also the fact that the toaster is already hot when you put in your bread a second consecutive time, it messes with the level of heat exposure that your bread gets.
So newer (and generally the cheaper) toasters use some method of heat measure to determine how long your bread should stay in the toaster. They tend to measure a so-called 'browning factor' of how brown you want your bread to be. However, different toasters use a different method, thus not only releasing the toast at a random time, but also at a different level of brownness. Also the fact that they're super cheap, they have a really shitty measuring mechanism, thus having to constantly change the number dial in order to meet your preferred level of brownness.
So newer (and generally the cheaper) toasters use some method of heat measure to determine how long your bread should stay in the toaster. They tend to measure a so-called 'browning factor' of how brown you want your bread to be. However, different toasters use a different method, thus not only releasing the toast at a random time, but also at a different level of brownness. Also the fact that they're super cheap, they have a really shitty measuring mechanism, thus having to constantly change the number dial in order to meet your preferred level of brownness.
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