If it's unclear from the description whether an audiobook is abridged or not, the length of the recording is a pretty reliable guide. An unabridged audiobook of a novel of average length will typically run about 7-8 hours. Longer books can be much longer - the unabridged Count of Monte Cristo (a magnificent novel, beautifully read by John Lee) is 52 hrs. Abridged audiobooks, otoh, are usually closer to 4 hour, maybe 6 for a very big one.
When I had a long commute I consumed audiobooks voraciously. They're an excellent way to make good use of drive time! Also very good at the gym, out walking, at home while knitting or crafting, pretty much any time that your hands or eyes are not available for reading a book. It's a somewhat different experience than reading -- for one thing, you can't flip forward or backward easily but have to stick to the linear flow, and you can't skip ahead or skim things. As a writer-in-training you may find this beneficial, because it forces you to experience every word and phrase and scene as the author wrote it, and to deal with their structure and pacing. (Those 52 hrs of The Count of Monte Cristo move very very quickly!)
One other way an audiobook is different from a print book -- it's not just you and the author constructing the text, the reader is also an active partner in the magic. And there's a lot of variation in the quality of audiobook readers. Some, to be blunt, are much better than others. Everyone who listens to a bunch of audiobooks quickly identifies things they particularly like or dislike in a reader, & has their favorites. (I myself would listen to Simon Vance or David Tennant read laundry lists with pleasure.)
(Audiobook readers fall into 2 main categories that I call "reading" and "performance." A "reading" reader just reads the words, the way you or I or the kid next door would read it. What you hear is a text read by a person. A "performance" reader takes a more dramatic approach and creates different voices for the characters and narrators, so what you hear is more like a movie for your ears. Either style of reader can be good or bad, depending on their skill and your taste.)