It is not possible to predict time like this in hours or days.
Microsoft Windows can overwrite a deleted file immediately if it selects the same data clusters to write new files to.
To maximize recovery chances try not to write anything onto the drive where a deleted file is located before you start using data recovery software.
We advise you to turn off the machine immediately, and attach your HDD to another machine running Windows, or to boot portable copy of Windows OS from bootable CD/USB (Active@ Boot Disk).
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