It's extremely scary. The vivid descriptions and eerie atmosphere created in the stories make your heart race. But for some hardcore horror fans, it might not be the scariest thing out there.
The scariness varies from story to story. There are those that rely on psychological horror, like the story of the girl who starts to lose her mind. It's not so much about jump scares but more about the slow build - up of dread. Then there are the more traditional horror stories with monsters and such, which are also very effective in sending shivers down your spine. The collection as a whole does a great job of appealing to different levels of horror enthusiasts.
You can look for rental options on popular online streaming platforms. Some of them might have it available for rent. Just search and follow the rental process.
You could check your local theaters if they are screening it. Or, you can subscribe to a movie subscription service that might have it in their library. Another option is to borrow the DVD from a local library if they have it in their collection.
The duration of Scary Stories to Tell in the Dark isn't fixed. It could be a few hours if you read the book quickly or longer if you savor each story. The movie adaptation also has its own runtime.