How late can a person be until i can be mad?

Say for example someone says theyll meet you in "about 30 minutes" and it is now 45 minutes later and they still havent even left to come to the meeting point (it takes then 15 minutes to drive to the meeting point)? For simplicity sake lets say there is no emergency or other super important thing thats... show more Say for example someone says theyll meet you in "about 30 minutes" and it is now 45 minutes later and they still havent even left to come to the meeting point (it takes then 15 minutes to drive to the meeting point)?

For simplicity sake lets say there is no emergency or other super important thing thats keeping the person makeing them late, and tue reason you are meeting is so that they can give you back an item that isnt paticularly urgent but is annoying not to have.

Would you be mad by this? If not how late dose a person have to be for you to be understandably mad?
Laslty what is the appropriate way to express that your mad at their lateness?
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