For a completely different angle, look into dramatic audio productions from companies like Focus on the Family Radio Theatre. They did an acclaimed, fully-dramatized series for Narnia with professional actors and cinematic sound design. It's more like an old-time radio play than an audiobook. These are often sold on Christian bookstore sites or general retailers like Christianbook.com. Even if you're not religious, the production quality is top-notch and it's a incredibly engaging way to experience the story. It feels like you're right there in the snowy woods with Lucy.
LibriVox has public domain audiobooks read by volunteers. Unfortunately, C.S. Lewis isn't public domain yet in most places, so you won't find Narnia there legally. That site is amazing for older classics like Jane Austen or Sherlock Holmes, but for 20th-century works, you'll need the paid or library routes. Just a heads-up to save you time searching there.
You know, I've never actually timed it. I just know it takes about as long as driving to my grandma's house used to take. It was our traditional 'car tape.'
We'd start it as we left the city, and Aslan would roar just as we turned onto her street. It was like clockwork. So for me, it's not 4:22, it's 'the length of a trip to Grandma's.'
I suppose that's not a helpful answer for everyone, but it's the truth! The runtime is woven into my personal history, not just my media library.
I saw a thread on a parenting forum where someone uploaded their own reading for their kid's class and shared the link. It was sweet, but you never know with those private links—they expire or get taken down. It's not a reliable source. For a stable, always-available free resource, your public library's physical collection is a sure thing. Walk in, go to the children's audio section, and there it is. No internet, no apps, no batteries required. There's something wonderfully simple about popping a CD into a player. It also teaches kids about accessing community resources. The library is a real-world magic portal, almost as good as the wardrobe.
My two cents: start with Hoopla. No waits. If it's there, you're golden. If not, then escalate to the commitment of an Audible trial. It's a tiered approach that minimizes hassle. Why give your credit card info if you don't have to?
This book is popular enough that there's a good chance Hoopla has it, depending on your library's contract with them.