Nah. It's not that simple. I think the editor made it to the 10% in unknown but not too long time and then couldn't anymore invest time into the project for a good while. Now it's already in 25%. All in all in stuff like this it's safe to say gathering the will and energy to do something may easily take more time than actually do it, depending on the circumstances.

So, it's impossible to predict how fast it will proceed. If the person(s) involved have lots of energy and eagerness, the editing might be finished in a month. If they get tired, they may take long breaks.

I have never translated games but I've been involved in game modding "business" otherwise for a long time and I kind of know what I'm talking about.