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Originally Posted by Fox Xray  The time off/void time is used because you are departing "non radar" meaning that a specific altitude stratum is being blocked for your departure for that specific time.
What you can try is when you are filing your flight plan add a remark requesting a clearance void time of 5 minutes ... maybe add due to A/C pre flight requirements. Not sure if it will work but it is worth a try.
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Tell ATC it is for operational necessity. They can't argue too much then.