Spouse used to work with an XO who was very, well, intense.
Single and in her low 40s, she routinely put in 10-12 hour days and worked both Saturday & Sundays. Not every one and not every week but often enough to make the troops edgy. (The command maintained a 24/7 watchbill.) She wasn't one of those bosses who had to have company while she was working but she thought nothing of calling you up any time of the day/night/weekend and getting publicly grumpy the next day if you weren't immediately available for a discussion. She pestered spouse during a leave period (before even reporting to the command) so frequently that spouse decided that it was just easier to cancel the leave and report for duty.
She was so stream-of-consciousness preoccupied with the job and the To-Do list that when a group was on travel they'd actually take turns accompanying her. She never caught on that no one would sit beside her for more than two hours. She was just supremely (yet narrowly) focused on optimizing that command and her job and becoming the fleet admiral, no matter how many lives she sucked into her own hard-working vortex. The Navy wasn't the biggest thing in her life-- it was the only thing.
One day this XO's father died and put her in charge of the family's charitable foundation. It's at least eight figures and apparently it's not just a Fidelity fund. She presumably got a salary or an expense account for having to take care of the thing. It was her personal equivalent of winning the lottery... eligible for a military retirement plus a big family allowance and a corporate credit card for life.
Her Go-Navy attitude completely turned around and she disappeared almost overnight. Her retirement request was processed so quickly (less than 60 days) that she must have told the CO and the admiral that she was going to burn all her leave and would never come back to work. Her desk was empty by the end of that week and she was flying on international fact-finding trips that weekend-- no one could reach her. She showed up once at the command (on the way to the airport) in expensive tailored civilian corporate business attire, dropped off her badges & paperwork, and she never showed up at the command again. She didn't even bother to turn over with the officer who relieved her. Although she'd been keenly focused on that XO job while she had it, once something better came along she changed her focus just like flipping a switch.
I sometimes wonder if I'm going to see her on Charley Rose's show sitting next to Bill & Melinda Gates...