何回 literally means "how many times", so it is "how many times do you watch movies/learn Japanese a month?", but yeah, it sounds more natural when we translate it as "how often do you watch movies/learn Japanese a month?".
We can also say,1か月に どのくらい(の”頻度/ひんど”で) えいがを 見ますか。 And its literal translation is "how often do you watch movies a month?"