My friends husband works four days on four days off. She's been training to be a teacher three days per week and is starting a full time teaching job in September. At the moment she does everything except DIY with regard to the house and children. They have different standards but I don't think she is OTT - I.e. If he spills something on the floor he'll wipe it up with a tea towel then put it back on the hook to use, whereas she'd put it in the wash. He puts the kids bath towel on the toilet/floor while they're init and she says this mmakes the bath a bit pointless if they're getting dry with a dirty/germy towel. When they lived separately he'd only hoover once per month at most! They have a dog who moults and df hoovers downstairs everyday.
She's worried that she'll struggle to fit all the household stuff in as well as fitting in the kids and working full-time in September. I said that as her dh has more days off, he should do more. However, because he'll be earning almost double her salary he doesn't seem to think he should have to do housework too 
He doesn't have to do any work at home on days off whereas she will have to. It seems ridiculous to me that she'll be run off her feet in term-time and he'll have four leisurely days off. Do you think he's BU?