You can write the number of lines that you’re comfortable with or you’ll just end up stressing yourself out.
In my opinion, long episodes with 4000 lines and above are too much. There won’t be any suspense, and eventually, you’ll get bored. Shorter episodes with 1000 lines and below are too short. They usually end very quickly. And some stories with short episodes I’ve read don’t keep me interested.
But again, it’s your choice.