Yes, lots of time, but also, smart use of said time. 
For me breaking into listening was a combo of:
- Audio flashcards
- Blind listening followed by read-along listening
- Lots of normal read-along listening
Audio flashcards:
So if you happen to have access to ~files~ through whatever means you can make excellent audio flashcards for Anki using Subs2SRS. There are also premade decks out there but I am not sure if I can share that link on this forum.
I suspended a ton of cards because they were too hard and highly recommend that over banging your head against a leech because you just. don’t. get it. 
Can always un-suspend later. ya know?
Blind reading:
What I mean by this is listen to a story/chapter/article once without looking at the text or any visuals. I just followed as much as I could and tried not to lose the thread. Then I’d listen to it again, with text aid. I’d look up words as needed. When I felt I understood, I relistened again blind. It’s really important to try to find something you expect will already be a comprehensible level for you reading so you’re just tuning your ear and not struggling to understand grammar and vocab. I thought Satori Reader was really good for this, and IIRC some of the news sites have narrated articles? Audiobooks are great if you can find ones at the right level and some JP hardsubbed youtube channels are good (I remember using this scary story channel a lot…)
Read alongs:
I still do this a ton. I read books with narration / alongside the audiobook. I don’t count that as listening hours, but I do think it helps train my ear, albeit to a lesser extent than the other methods.
I honestly think the first method helped me actually break through the wall of omg-they-speak-so-fast-why-can’t-I-catch-any-of-it and the second one built my stamina for longer listening sessions.
Hope that’s helpful and looking forward to seeing what others did