In response to the original question, yes I have had several clients run checkdb nightly on their TB+ databases. 3.5-4hrs was normal.

There is a tweak that can be made to help it run faster by using resource governor to limit memory which helps checkdb run faster.

http://www.sqlskills.com/blogs/jonathan/dbcc-checkdb-execution-memory-grants-not-quite-what-you-expect/

Download a preso by Argenis Fernandez here.

http://performance.sqlpass.org/Home.aspx?EventID=1047