Fully animated films are often animated on "twos", sometimes on "ones", which means that 12 to 24 drawings are required for a single second of film.
fˈʊli ˈænɪmˌeɪɾᵻd fˈɪlmz ɑːɹ ˈɔfən ˈænɪmˌeɪɾᵻd ˈɔn "tˈuːz", sˈʌmtaɪmz ˈɔn "wˌʌnz", wˌɪtʃ mˈiːnz ðæt twˈɛlv tə twˈɛnti fˈoːɹ dɹˈɔːɪŋz ɑːɹ ɹᵻkwˈaɪɚd fɚɹə sˈɪŋɡəl sˈɛkənd ʌv fˈɪlm.