I need to know what type of speeds I should be getting when duplication backups.

I have a single Master/Media server so there is no network involved when
duplicating tapes.

Currently I'm seeing duplications take 5 - 8 times longer than the backup
Example 1 image took 6 hours to backup and 29 hours to duplicate.

While this is not acceptable for our environment I'm wondering what to shoot
for. I would expect duplications to be faster if not at least the same speed as
the backup.

Any input is appreciated.

Thanks