It will deduplicate files older than 3 days and it will run depend on your set sechdule.
Take a look at:
https://learn.microsoft.com/en-us/windows-server/storage/data-deduplication/advanced-settings#modifying-job-schedules-available-settings
This does not mean it will run in three days but it look into files which are older than three days.
When start deduplication start after we enable it?

Samath
121
Reputation points
Hi,
I just enable deduplication on my I: drive of Windows 2019 file server.
Do I need to start it manually or it will take 3 days after we enable it?
Accepted answer
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Reza-Ameri 15,266 Reputation points
2021-09-05T15:17:16.9+00:00
1 additional answer
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Limitless Technology 37,751 Reputation points
2021-09-06T09:48:27.253+00:00 Hello,
Thanks for reaching out.
After enabling Deduction you do not need do anything as Windows should take care of it.