Reddit reviews The President's Book of Secrets: The Untold Story of Intelligence Briefings to America's Presidents from Kennedy to Obama

Dude, it's in almost any book written about Bush's time in office. He read them, but he also got an in-person briefing by a CIA officer. Normally the VP and other people sat in on the brief. It's not up for dispute whether or not he read them. The question is why he didn't take them seriously, which is a different question.

Edit:
Here's a surprisingly topical book. link

I think it may be 'The President's Book of Secrets: The Untold Story of Intelligence Briefings'

>Former Central Intelligence Agency briefer David Priess, the author of a book about PDBs, said that traditionally, Trump and Pence's predecessors sat for "daily or near-daily intelligence briefings" between their elections and their inaugurations.

>He said Jimmy Carter and Ronald Reagan did not start receiving their daily briefings until later in November, while the delayed election result in 2000 meant that George W. Bush did not start receiving his until December.

If you want the number of days each sat for a briefing before inauguration you will need to read Priess' book. Here ya go. Have a ball!