Drive Wiper taking 23 hours to wipe 1 TB USB 2.0 HDD

Is this normal?

I'm only using a Simple Pass (whole drive).

I want to sell the drive, therefore I want it wiped. But I don't fancy waiting this long :/

1TB at USB2 speeds, I'm guessing that is sort of ball park.

It would have been no worse to simply low-level format the drive by right clicking the unit in My Computer.