How often does Netflix introduce new movies to play instantly?

[RobotWorld]

I just got Netflix, rated about 200 movies so that Netflix will suggest movies I would love then I went to the "movies you'll love" tab and went through 35 pages of movies. So now I'm wondering how often does Netflix add movies that you will be able to instantly watch? Is it like every month on the 1st, there is an updated list of movies you can instantly watch or so?

 

[Crystal]

It dpends some months they will add one or two and then all of sudden BAM you'll have like thrity more choices.