I honestly do believe (as some have said,) that men spend all this time in the bathroom for some time to themselves. (And it IS always men!) And in many cases, it's to shirk responsibilities, and childcare etc...
Years ago, men used to do overtime at work, and go to the pub with their mates, or go play pool or darts, and partake in many hobbies, like golf, fishing, and amateur footie. (to get away from family responsibilities.)
But lots of these things aren't as readily available as they used to be, and many families can't afford for one parent to spend 1000s of £££ on fishing or golf, and similar expensive hobbies, and most workplaces don't offer overtime now, to enable him to get away til 7 or 8 in the evening. So to get some time to themselves/shirk family responsibilities, they naff off to the bathroom for an hour at a time with their smartphone!
My DH used to do all the overtime going, back in the day, when the kids were little (1990s,) and I did literally 95% of the child-rearing and housework and all the general 'family' stuff. (even though I worked 22 hours a week!) We didn't even really need the money that much; he just used to spend it on his own hobbies, and me and the kids didn't see any of the 'overtime' money.
And he wonders why the kids (now they're in their mid to late 20s,) are much closer to me than him. I know many other women who have experienced the same, and their kids are much closer to them too.
So, to all the men who shirk family responsibility, by naffing off for hours on end to the bathroom, with your smartphone, or tablet, and leaving your wife/partner to do everything, (including the lion's share of the childcare,) be warned.
DH is proper miffed that our adult children are much closer to me now, but it's hardly surprising considering I was the one who raised them while he was rarely there.
Weirdly, now the kids have left (some 6-7 years now,) DH is always at home, NEVER does overtime, has no hobbies except watching TV and playing video games, and has cut his hours down to 28 a week! 'So we can spend more time together' Funny how he never did it when the kids were at home. I can't get the fecker out of the house now!