I don't do this full time. I can't as my support is unfortunately not enough to support me financially so this means I have a day job. Making each episode is between 3-4months.
There is a lot of work involved. I have to create each image (scene) in DAZ. Then it's rendered. Then each image (animation images too) into Photoshop and processes and saved in webp format. Then I compile it all together in RenPy and do most of the coding. The difficult or anything added to the coding is done by my Lead coder. But I put the episode together. This is basically dialogue for each image and how it will flow.
Then comes QA testing of the images and Alpha work which is proofreading/editing by my proofreader and Lead coder does his magic.
Then beta testing, if any fixes i do them and then I can release.
So yeah lots of work. But most importantly in between creating everything I have to keep myself motivated and still happy to be making a game. If I don't enjoy it all then I'll stop.