Tv is almost an hour in the mornings while I'm getting ready for the day. And then an hour in the evenings when I'm too tired to deal with him anymore and need to recharge before bedtime (and also need to get dinner ready etc). Sometimes it is maybe a bit more if we are having a difficult day. I never watch tv with him, only use it as a babysitter. The rest of the time we do the usual playing together, stories, songs etc or he plays by himself.
That sounds fine to me. You're not dumping him in front of it for a 3 hour block in the afternoon while you MN followed by being left to play on his own while you vacuum and make the dinner. You're using it to keep him occupied while you're otherwise engaged and my guess is that you'd still need to get dressed and cook meals at the beginning and end of the day if he was attending nursery.
If he sleeps for the about 12 hours that still leaves 10 hours in the day to be interacting with you and playing. That's masses of really valuable learning and developing time. This includes meal times, tidy up time, bath time, etc.
In that 10 hours he can help you with shopping, learning about how to buy things, where food comes from, helping plan meals, he can post letters and find out where how they get where they are going, help with gardening and learn how things grow,.....
He would still do all those things in nursery but on the days they plan it and within the constraints of a restricted physical environment and in the context of meeting the needs and interests of all the other children, not just him. You can do it on the day he is suddenly interested and ready to learn about it and be spontaneous about where you go and what you show him.
Only you know the quality of the experience he would be getting at home with you but don't overestimate the quality of the interactions they would get in nursery. I've been a nanny, a childminder, a SAHM, and worked in a nurseries and pre-schools and I would choose time at home with a loving and supportive mum who enjoys helping them explore the world for my child every time.