A quantum is the time between interrupt pulses, and represents the time each program will have allocated to it to run. a quantum specifies the duration of time an interrupt delays for, before sending an extra pulse to the CPU. This is to properly coordinate the functions of the input and output devices of the computer better.
Quantum times are not usually fixed. they can be 1 millisecond or up to 10 milliseconds depending on the tasks that need to be performed
