It’s not sufficient to be an intellectual but if you don’t care about questions that aren’t solved in short amounts of time because that’s very uncomfortable for you, you won’t have a deep understanding of anything. You might memorise the teacher password in many domains but that’s not what being an intellectual is about.
I’m not sure that’s a critical part of any definition of the word “intellectual”.
It’s not sufficient to be an intellectual but if you don’t care about questions that aren’t solved in short amounts of time because that’s very uncomfortable for you, you won’t have a deep understanding of anything. You might memorise the teacher password in many domains but that’s not what being an intellectual is about.