Justice, we are not making an empirical claim at all. Nothing in our Copyright Clause claim hangs upon the empirical assertion about impeding progress. Our only argument is, this is a structural limit necessary to assure that what would be an effectively perpetual term not be permitted under the copyright laws.

Based on that paragraph can we conclude that this sentence is true?
This case has gone on for quite some time

Available options:
 +Yes
 +It's impossible to say
 +No
It's impossible to say