If you want to allow a client to choose between a meeting of 1 hour and one of 30 minutes, you don’t have to create two different meetings; one of 60 minutes and one of 30 minutes. Instead, Cal.com offers you the possibility of using the same event-type and offer meetings with several durations where the booker can pick the preferred duration.Documentation Index
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There are multiple options to choose from, and no limit on the number of durations to offer the booker from these options. You also have a default selectable for situations where the booker doesn’t necessarily need to select a duration, just that they have an option to choose one.