Restore duration

[targsx]

Anyone can please share their experience regarding duration of full server backup restore? How long does it take?
I am testing this on win2003, plesk 9.5 with 10 gb backup file, quad core xeon procesor, 8 gig ram, sas hard drives, and its taking ages. In period of 4-5 hours it restored only 4 clients and 4 domains. This cant be right.

Thanks