A phrase I heard about writing (possibly from Robbie Morrison) was;
You need to get 100 pages published to clear the crap out of your system.
Now this statement was made about comics writing. But you get the idea. We all have a certain amount of frothy head on top of our home brew that we need to get past to get to the strong stuff.
It could be 5 TV episodes. It could be 6 shorts. It could be 3 feature scripts. I'm not sure how easy it would be to seek a common standard for us as screenwriters. I'm not sure I'm even there yet! Are you?