The smell will be noticeable. How far away…that depends. Last year I grew 4 plants in 15g pots next to my deck. It was VERY noticeable. My neighbor (who we’ve had issues with in the past) definitely wasn’t pleased. As a way of ever so slightly smoothing things over I set up a greenhouse for this past season.
Despite my best efforts those girls over grew the greenhouse vertically. I popped out the roof panels and let them live their best life. This year I ran 6 (legal limit here). Also worth noting the greenhouse was set farther back in the yard. Seemed to help because the smell was far less noticeable this year. I mean, you could still get whiffs of it from the street on occasion but it wasn’t as overpowering as last season.