Out of curiosity I timed myself reading the Nunes memo, the full 6 pages including the introductory information about the process of declassifying it.
Took 4 minutes and 18 seconds, though I always tend to read at a fast pace. And it's not in my native language so I could probably do it faster without translating at the same time.
I assume a 10 page memo would take me about 10 minutes or so, probably a little less. You'd think the man could find a spare 15 minutes during his Executive Time™. Reading a few pages of a memo isn't exactly a tough task even if it contains some big words or acronyms he may struggle with.