Reminder: Boardable users who are assigned as Administrators, Members, or Group Owners can create meetings.
The Scheduler does not currently support multi-day meetings, but there are a couple of ways to work around that if your meeting is longer than one day.
With the Scheduler, you can offer all potential dates as individual options, and instruct meeting members to select availability for each multi-day range you're considering. When you select the final meeting date(s), you can set the meeting to start on the first date of the range, and be sure to include the full date range in the meeting's description field.
Another way to evaluate availability for a range of dates is to create a poll and use the dates as answers to choose from.