I think it varies, yes. People have smaller bladders, some have larger. It also depends on how reactive you are to the sensation of a full bladder, and how risk averse you are to having it full -- perhaps you have had bladder issues, infections, etc. in the past and are mandating a self policy of frequent urination. But it's just a reference range, and if you ever took a blood test, you realize they might not matter some times.

I feel like bowel issues are worse though, since you delinated them. You never ate something that went down wrong? The worst experience I ever had was eating shrimp that caused food poisioning. I practically lived on the toilet, and I think my understanding of what IBS from having a family member who has is gives me a perspective that only offers sympathy rather than criticism unlike other posters. I don't blame people from being doubtful that perhaps the lady in questions self diagnosed as IBS and didn't get a doctors note because it was balogne, but the invasion of medical privacy and heavy handed get-the-note or be-fired dialoge tree the manager has seems fucking bonkers. I suspect it's just an excuse to fire a system designated target -- as amazon does and they just quipped up a reason to fire her.