@smoko I'm not sure sex is the OPs focus as much as quality time together having read all his posts?
OP I think for some posters you could produce the most detailed schedule of everything you do, list out every household chore and it's split and you'd still find some who will say 'ahhhh but you haven't mentioned xyz so she must be doing all of that'
There was a post I recall similar to this earlier in the year where the poster equally got asked again and again if they really, really did everything they said they did-the poster then clarified they were a woman in a same sex marriage and surprisingly the questions and insinuations stopped and focus shifted to solving the problem at hand.
To your question. I, like other posters spend a good few hours an evening with my DH. We have one DC (2) and I'm currently 30 weeks pregnant and I do also have an underlying health condition which means I suffer from tiredness.
But I can cope with 7-8 hours a night. So DC in bed by 7.30 latest and I'll probably go up 9.30-10ish. My DH comes up about an hour later. We both WFH together and eat lunch and do lunch dog walk together 3/4 times a week.
Weekends are split lie ins one day each and we are lucky that DC still naps so have lunch together too.
We are also lucky to have parents who babysit so once a month we have a night to ourselves and will try and have dinner out or cinema etc. Or if DC has been taxing, just go to bed early together and sleep!
I anticipate this time will be reduced when DC2 arrives but once they are reliably set in a bedtime routine, we should get our evenings back.
Occasionally I'll be quite tired and decide to go to bed earlier and DH will often come up with me and watch something in bed while I doze which I quite like.
One thing to consider-I'm more of an introvert than my DH and I lived alone for a few years before we moved in together. DH has never really lived alone. I really value 'me time' and I've found covid has meant I have a lot less time to myself due to DH wfh and us being a bit more cautious about going out to the pub etc. 'Me Time' doesn't necessarily mean a spa day or anything fancy. It is often simply an evening to myself to watch trash tv, read a book, have some space to relax... I do this once a week but sometimes need it a bit more, especially if I'm feeling touched out by a clingy 2 year old. I wonder if your DW has felt the same since covid and her going to sleep is simply spending time on her own for an hour or two an evening?
Either way, your summary earlier of possible actions seems spot on. But I think this thread backs up that, regardless of the reason, only getting 2-4 hours of quality time together a week is unusual.