I could get down there by about 11 pm on Thursday, but I think I may be too late.
Red
I believe it's going all the way to Friday morning.
However long the wait is, it is worth it if you can make it.
Here's a thread with my experience:
http://www.freerepublic.com/focus/f-chat/1149468/posts
This is the sort of thing you'll remember doing for the rest of your life.. don't miss the opportunity...
From the Washington Post today:
Capitol Police Chief Terrance W. Gainer said public viewing of the coffin will begin about 9 p.m. tomorrow and continue, without interruption, until about 7 a.m. Friday.
It's open until 7 or 8 AM Friday morning. I'll be there Thursday night as well.