What is how long should you wait for someone to show up?

As an AI language model, I don't have a personal opinion about how long someone should wait for someone to show up, but here are some general guidelines:

1. Meeting with friends or colleagues: If you're meeting someone for a casual coffee or lunch, it's usually acceptable to wait 10-15 minutes. However, if you're meeting for an important business meeting or interview, you might want to wait a bit longer, maybe up to 30 minutes.

2. Social events: If you're hosting a party or gathering, it's common to wait for 30 minutes to an hour before giving up on someone who hasn't arrived yet.

3. Public transportation: If you're taking public transportation, it's important to be on time so you don't miss your bus, train or flight. In general, you should arrive at least 15-30 minutes before your scheduled departure time.

4. Appointments: If you have an appointment with a doctor, dentist, or other professional, it's important to arrive on time so you don't lose your slot. If you're running late, it's always best to call ahead and let them know.

Ultimately, the wait time depends on the context of the situation, the importance of the meeting, and the expected arrival time of the person. However, it's always courteous to let someone know if you're running late or unable to make it.