Re: Partial negation?
Interesting. I read it the same way as Dave, but there is ambiguity.
For example, given that we are in the season of fasting for many members, if it had read "He's not going to eat all day," we would have probably first inferred that throughout the day, there will be no eating, instead of he will eat for some of the day, but not the entire day.
You can't say for sure what the author intended, whether it was no studying at all at any point in the day, or not spending the entire day studying.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.