Why my Time Machine backups do not take many hours?

I recently changed my external backup of a disk in a big flash drive backup.  Some of the Time Machine backups take several hours, sometimes all night or more.  General info on Time Machine Prefs will show large backups, as now "backup 39.6 89.7 MB, with a remaining time" (the flash drive is only about a quarter of full.)  Is it normal for a backup of the USB?  Thank you.

How the drive is formatted? It should be in Mac OS Extended journaled.

Tags: Mac OS & System Software

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