The total content on Bandersnatch is officially 5 hours 12 minutes. This can be verified by multiple publications. But TMDB has 1 hr 30 mins as the runtime. There are storylines in the film that last from 40 mins to 2 hours.
As someone who has gone through all the endings, I think the time reflected should be that collectively of all the content, which is 5 hour 12 minutes instead of the 1 hour 30 mins as that really makes no sense. Almost everyone I know or am seeing on social media is definitely watching way more than that due to multiple endings and reversals.