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.
Download a preso by Argenis Fernandez here.
http://performance.sqlpass.org/Home.aspx?EventID=1047
Jason...AKA CirqueDeSQLeil
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I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
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