I'm currently averaging 1.5h of video/audio a day and sure, some days it feels like a lot - work is busy, I have to go to the office, gym, and all.
But I'm trying to cross the line of 'I can understand without having to focus really hard' as quickly as I can because then immersion is so much easier. TV, books, podcasts - what I do on a daily basis will all count towards my immersion.