X scenes or minutes of content per month is how you end up with slop.
If all you care about is the number of scenes and amount of gameplay time, there are plenty of other H visual novels that can waste a lot of your time... however I would assume you're here for this story and this quality, which simply can't be squeezed out like a quickie. And that's assuming one is spending all of their waking time doing it. It gets even harder when you assume they have a life and aren't some kind of hikkikomori ecchi addict.
It would be unrealistic even if all he was doing was writing a book. That's simply not how this works, and trying to force it to be otherwise is why so many anime, game, writer, and other artists literally end up spending weeks in the hospital or having life ending depression issues.
We will wait however long it takes, there is no alternative.
Keeping the fans happy is irrelevant if the attempt to do so causes a bad product and ruins lives... because that certainly doesn't make fans happy.
Be happy you're not being charged anything to get updates. You're getting this for free if you choose to. Remember that, because you certainly aren't owed nor deserve it.