By default, this action will reboot the remote computer in 30 seconds and it will popup a window prompting the user who will be able to defer the reboot 5 minutes.
Please note that there are other configuration policy values in the same location which can impact the reboot behavior like:
"Time before reboot" which is set to 30 seconds by default
"Defer reboot retries" which is set to 1 retry by default
"Defer reboot time" which is set to 300 seconds by default.
More information on this topic in the following link:
RCHost General Policy Group