While he has helped care for his wife's aging parents, the couple still sometimes butt heads over who does things like walking the dog, now that he is out of work.
My friend and I, when we first did the experiment, couldn't get over how awesome this was, and while the effect was less noticeable after 3 or 4 months, it was there right up until I quit.
Many businesses use Gmail (either for free or on a paid plan), so it became quite noticeable when the service was out for a whopping 30 hours for some people.
We started well for the first 25 minutes and then when they equalised you could see that we were wobbling a bit with confidence. At half time the team regrouped and then the second half was all us.