Someone on Reddit posted a photo of their crazy office bathroom policy. If they take longer than 10 minutes, someone goes in after them to do a "smell check" . . . to make sure they were really doing their business, not just playing on their phone.
The sign on the bathroom door says, "If in bathroom for more than 10 minutes, a smell check will be completed to ensure employee [was] not sitting on [their] phone. If it does not stink, employee's name will be reported to [the] office." (Here's the photo.)