Farby; bitul torah is a subjective issur – it depends on “where you’re holding” and how much you can learn. See the ohr somayach, 2nd piece in hilchos talmud torah. While the sky is the limit to how much we can and should learn, the obligation starts at the bare minimum of krias shema morning and night, and grows as you grow, to where if you can handle learning 3 hours, then learning 2.5 is bittul torah.
I didn’t mention bitul torah in my post because of this; the problems with movies and goyishe culture as a whole have little to do with bitul torah and more to do with akiras hadas (and hada’as), deep intellectual, emotional and spiritual contamination, naking you think and feel like goyin, and cultivating other interests and values besides avodas Hashem.