Execute my action 10 mins before

I kept my windows CRQ start time in file - “HKEY_LOCAL_MACHINE\SOFTWARE\CRQ\Maintenance\Reboot” of native registry" . Attached the file for your reference .

My doubt , I want to create one relevance which suppose to start my action 10 mins before based on the value in file “HKEY_LOCAL_MACHINE\SOFTWARE\CRQ\Maintenance\Reboot\WindowStart”

Example : My WindowStart" time : 1000, then , my action has to start 10 mins before . 0950 like that.

How we can do ?f1