ATA enhanced secure erase takes long time to complete

This is a 160 GB rotational drive. Non-enhanced secure erase took about an hour and a half to complete. Enhanced secure erase is taking hours (more than a day) to complete, even though, the estimated completion time is 54 minutes (for both enhanced and non-enhanced erasure). Is this fine or should I be concerned?

How do you securely erase your internal hard drive, using any OS’s tool or software?

You may use Data Lifeguard Diagnostics tool to completely erase your internal hard drive and the estimated time to complete the process would be comparatively less.