Oracle DUL performance/speed

Hi gurus,
I have a customer , ct has a 18T database.
Unfortunately, the backup is no use.

CT want to retrieve the data from these datafiles using DUL.

Assume ct has redundant hardware resource.

Please help to estimate：

How long will cost DUL to retrieve all the contest from the 18T datafiles?

FYI pls check this link:

http://www.parnassusdata.com/en/emergency-services