I'm no calculus teacher, but 18 - 1 = ?
OK, you were talking literal 17 hours flat. I guess I can appreciate that except what's to stop someone from bitching about seconds?
This is the report I think anons have been looking for about the WTC7 news report claiming the building collapsed 20 minutes before it happened. I remember this very well from BBC. Pretty sure the building is still standing behind the reporter.