A big project for multiple decades? for work or the story? I think if you have set working hours and not-working hours and meet the deadlines, it's fine!

The problem with this project is that it was so hard to judge how much the workload would be cause it's written text that was screen capped and scrolled through in a video. No way to count how many works or pages it was, and not all of it needed translation...and it had no deadline. Also I don't need to do it for work. I'm getting paid but it's more of a favor for someone who has helped me immensely. I didn't realize what a commitment it would be.