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Member since Oct 23, 2020
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The only way to get an estimate I can think of is running the compact against a SAN snapshot on similar hardware.
The free blocks could be anywhere in the file and that plays a big role.

Here are some numbers:
Current Size: 2332950 MB
Freespace at end of file: 300 MB
Total freespace: 8957 MB
Blocks Scanned: 10850564
It took 1 hour 44 minutes

The truncation was almost instant.

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