A completed episode that has four seperate branches for male/female MC and male/female LI takes up around 25,000 lines for me. But that’s also including plot points through #, labels, gotos, choices, gains, etc.
If it was just dialogue, with no directing (and no branching), I’d say it’s more 600-800 lines on average.
Depending on your style, the amount of lines you use can drastically change. Some writers use spaces, some use notes to keep track of what’s happening in their script.
Nothing personal 
I was just explaining to this thread writer.