I have great sympathy for the OP. My DH is identical - except he wasn't particularly good at his job as a Uni Lecturer. He only wanted the job cos of the long holidays that lecturers then had. He was greatly miffed when he was passed over several times for promotion by young, enthusiastic people. He ended up with his main responsibility being for teaching timetables, a job he could do at home, and guess who did it for him?
It took me about three years after marriage to realise he just wasn't "into" housework of any kind. As with the OP I had to remind him to mow the lawn or clean the bathroom, and he took hours over each task, often not completing them or doing them badly. Ever task was interspersed with many breaks for coffee or food, or a bit of telly, or listening to the News (again), and long baths at the end of the day.
At first we had a little semi, then a smallish detached and finally (with two children) a 5-bed detached with 5 downstairs rooms and large garden. While he went off to his job at the Uni I combined childcare with housework, finances, organising holidays, and building a self-employed business for any spare hours I had. I can't think of one job that he took responsibility for - as with the OP, I had to remind him that the lawn needed mowing, or he needed to crack on with lecturer prep. He once took over the family finances and within one month we were overdrawn/ I never let him near the finances again.
In hindsight, I should have left the marriage early on, but threw myself into my business, and later a full-time (and I mean 60 hours a week plus 90 miles a day travelling) job which I did without any help from him, and still did all the household stuff. Every holiday was organised by me, ever day out, everything really. I IMAGINED and EXPECTED that some tasks at least would be his responsibility, like keeping an eye on the state of the garden fence while he was mowing the lawn, but eventually learnt that he could only cope with one thing at once - the mowing - and checking the fence was a separate job, that of course he forgot to do. I use this as just one example. He is quite capable of coming in through the front door and not seeing the pile of post on the doormat. If he did notice it and bring it into the kitchen, he would open it, not read it, and leave the envelopes on the worktop and walk away with a cup of coffee, totally ignored.
doo
I didn't really notice how little he did cos back then I just got on with it, but retirement in our early sixties made it all obvious. While he sat around reading the paper or watching useless TV I wouldd be doing everything else in the home.
He is not useless at DIY, in fact he is pretty competent. The main issue is getting him to even start at task, and then waiting hours to finish it (if he ever does). At one point I bought a tiny flat near my work to avoid the long journey there and back, and bought myself an electric drill. I was amazed as to how quick and easy it was to erect flat-pack furniture, put up curtain rails etc. after years of thinking it was a laborious job!
Now he is physically incapable of much at all. I have to dress him, be there for safety when he showers, do all the housework, gardening, DIY, finances, arrange holidays (and do most of the driving) etc. etc. He has been having physiotherapy on and off for 14 years, each time being discharged because he doesn't keep up with the exercises. As a result I have little sympathy for his pain and discomfort cos he won't even look after his own body.
For 52 years I blindly imagined that he would change, that something would make him realise that he has to make an effort, if only for his own benefit, but he won't (and now probably can't). He was 5 foot 11 when I married him and I am 5 foot 3, but he can't even stretch up to get his muesli out of the cupboard or anything higher than the base of a wall cupboard. He even struggles to turn on a tap, and he can't reach up to shampoo or rinse his hair. Not that he has ever cared about his appearance. He is happy in dirty clothes, including socks. I remind him once a fortnight that he needs to take a shower, but he won't entertain a stand-up wash in between.
If I knew then what I know now, I should have left him years ago but certainly at our retirement, cos he seemed to have written life off by then and I certainly had not.
Those posters who have made out that the OP is in the wrong are so condescending. I almost hope they get theri comeuppance in the future. I do suspect my DH might have some variety of ADHD (oh, and the hoarding of rubbish is phenomenal) but he scoffs at the idea and certainly wouldn't make any effort to find techniques to help himself (and definitely not me).
Basically I hate him now. It should never have got to this. I should have left years ago.