Respectfully, that's a proverbial crock of trite bullshit perpetuated to game the naive/inexperienced.
If the next level above me couldn't spend at least 45 minutes thinking about the general problem I've been trying to solve in the past week, then that person:
a.) is stretched way too thin (which should be pretty obvious); or
b.) seriously needs to GTFO for the sake of the rest of the team.
P.S. As a de facto (not even official) technical lead on a US$3mil+ project that I've been assigned to, I spend at least 45 minutes a week sitting on a toilet bowl thinking of ways to improve the performance of my team while literally taking a shit. What's your project manager's excuse?