5 ms·

I wish the author had provided a source for their claim.

• EGreg 4y ago
  I don’t.
  • hanoz 4y ago
    Quite. It's too depressingly plausible a thought as it is, without digging up evidence that it might actually be true too.
• msufan 4y ago
  exactly -- it's almost like the author just made the number up out of thin air or something...
• dcotter 4y ago
  It looks like a back-of-the-envelope calculation to me: twelve summers before the developmental changes she mentions divided by sixteen, when they start driving, get a summer job, start dating, etc. You could probably plot a curve of hours per summer, starting to decline at twelve and declining fast after sixteen...
• glitcher 4y ago
  I'm sure it's within a +/-25% error range.