There is no upper limit for file durations!
For the languages listed below, files exceeding 10 hours will be split into two parts (e.g., a 12-hour file will be divided into a 10-hour and a 2-hour segment):
English (General, Australia, United Kingdom, United States), Spanish, French, German, Italian, Portuguese, Dutch, Japanese, Chinese, Finnish, Korean, Polish, Russian, Turkish, Ukrainian, Vietnamese.
For languages not listed above, files longer than 4 hours will be split into two parts (e.g., a 6-hour file will be divided into a 4-hour and a 2-hour segment).