Personally, I'd need a complete breakdown of who does what to fairly comment, Cooking, cleaning, ironing, dusting, hoovering, food shopping, clothes shopping for DC, other household shopping, cleaning windows, gardening, car maintenance, attending appointments with DC, sorting other appointments (ie boiler service, emergency repairs), monthly finance, savings, insurance. It all takes time.
We felt there was a similar situation with my BIL and his wife, and she worked less hours than him, he always seemed to be the one doing the hoovering, cooking, gardening, car maintenance - she only ever spoke of sorting clothes, but like I say I don't clearly know who did what else. Either way, he was clearly very happy and didn't seem worried about it, and they've been together 32 years.