For now, there is a limit in Trafft that impose a limit to 6 calendars maximum to check the time available and allow people to book an appointment when those calendars are available.
However, Google Calendar and most Calendars allow to have sub-calendars, to separate personal calendars, professional ones, several businesses or teams we might have as well as leisure activities, sport, online meetings, onsite room bookings availability etc. So this can be quite frequent for a user to have more than 6 sub-calendars on Google.
So that would be useful to allow us to select more than 6 calendars to check schedule availability before allowing clients to book a meeting. Thanks