I, like many others, am waiting for the announcement of the 1080ti hybrid edition to be announced and available for purchase. I am considering building a whole new system for it to go in and want to know how long the cards are so that I can find a case that it will fit in. 

Better still, is there a way to search for cases that will accommodate a certain length of graphics card? I've only ever build one system before and had a lot of help.

Just look at the specs for the card you want and you can see the length of the card there.
 
As for searching for cases that takes a certain length of cards I only know of a swedish site where you can choose that and many other things in the search creiteria.
 
The site is: prisjakt.nu
 
Edit: But those cases are only what are available in sweden and only in stores that are connected to that site, so maybe not the best place for you too look.

Didn't even think of that. Thanks