Disturbed by his loyal legions exaggerating Trump's work ethic when the old man can't stay awake for 30 minute meetings or events unless he's the star of the show doing the talking.
Trump's been criticized for later start times -- not meeting with anyone before 11am. Lots of unstructured "executive time" for often focused on Tweeting and watching television. Not sure where 18 hours comes from -- the NY Post had an article that said 12, and there's a lot of question of how he spends even that time.