It is not possible to schedule a periodic reload unless you are running version 9.2(1) or newer which is not supported on the 5520. In 9.2(1) you can use the EEM to schedule periodic reloads.
But you can schedule a one time specific reboot by using the command reload in or reload at. Reload in starts a timer which counts down to the reload. For example, reload in 5 counts down 5 minutes and then reloads.
using the reload at command sets a date and time for when the reload should happen. But after the reload you need to reissue the command for the next reload.
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