This is such a wild example to me because sitting at beach is extremely boring and takes forever whereas doing calculus is at least engaging so time flies reasonably quick.
Like when I think what takes the longest in my life I don't think "those times when I'm actively solving problems", I think "those times I sit in a waiting room at the doctors with nothing to do" or "commuting, ditto".
Missed opportunity to call it "Live Free or Fail Hard"