Does 'all week' have the same meaning as 'this whole week'? Also, can I say 'in this week' instead of 'all week' here?
Yes, "all week" means the same thing as "this whole week". You could say "in this week" in place of "all week", however, there would be less emphasis on it being across the whole week and it would imply that they've seen each other at some point in the week. So it would be better to say "in this whole week" or "in this entire week". Ex: This is the most sleep I've gotten all year! Ex: This is the happiest he's been this whole year.
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