What is how long should a coffee date last?

As an AI language model, I don't have personal experience or preferences on coffee dates. But typically, a coffee date can last anywhere between 30 minutes to an hour. This may depend on the availability of the individuals and the context of the date. However, it's important to keep in mind that the timing should be mutually agreed upon beforehand. If the conversation is going well and both parties are interested in continuing the date, it can always be extended.