These docs are for an old release. Info on upgrading to v5
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The frequency that the time slots should be labelled with text.

If not specified, a reasonable value will be automatically computed based on slotDuration. When specifying this option, give a Duration-ish input, like "01:00" or {hours:1}. This will cause the header labels to appear on the hour marks, even if slotDuration was hypothetically 15 or 30 minutes long.