I have lived with roommates for a while and have almost never had exclusive use of any bathroom where I have lived. I currently share the bathroom with a student from India. He mainly studies at home. When he first moved in he asked what the bathroom schedule was. I thought this was an odd question and told him there isn't one.
He literally spends 30-60 minutes 4 times per day. I think that part of the problem is the timing. For example most people eat lunch between noon to 1PM and need to use the toilet about an hour later. In North America people usually don't take a shower and brush their teeth between 1-2. This is really impacting me. I've started going to stores and buying things just so I can use their bathroom.
How can I address this issue? I would really like to stay on good terms with him. I don't like having many rules because there's always an exception.
I could try
I was thinking about when you first moved in you asked what the bathroom schedule is. Is there a certain time you normally use it?
but this just feel weird to me.