How long does the erase process take?
The time it takes to erase a hard drive is limited by the speed of the hardware being wiped, not the software. Each sector on the drive must be overwritten to ensure that the data has been erased.
And older hard drives will take much longer to erase than modern drives.
Larger drives will take longer to wipe than smaller drives.
Drive Speed is another factor that determines the length of time.
The following table may be some help: