1D Mark IV - How Much Video

[Jus10m]

First off, I did try!
I tried finding the answer to this in the forums, but with no luck.

Would anyone here know the ratio of length of 24p video to storage space on the 1D Mark IV?
Is that info accessible yet?
If not, what is it for the 5D?

Thanks everyone!
-Justin

[ydgmdlu]

~12 minutes for 4 GB. 4 GB maximum clip size.