Girlfriend first watch. Can I risk extended editions?

Title. My girlfriend has never seen the movies, and has expressed openness to watch them all with me. Can I / should I try to go for the extended editions? Or do you think i should just have her watch the theatrical release?

She doesn't have a short attention span or anything, i'm moreso just curious about if it can be overwhelming to watch nearly 12 hours of something if it's your first time. :)