The googleDirections plugin allows you to display Google Maps directions with multiple destinations or stopovers.

Details in this article: Google Directions with Multiple Stopovers

Many users have asked: "Is there a maximum number of waypoints or stopover points?"

Maximum Number Of Waypoints Or Stopover Points

• Please refer to the official Google Maps API documentation: Google Maps Javascript API V3 Reference
• Heading: google.maps.DirectionsStatus class
• Constant: MAX_WAYPOINTS_EXCEEDED
• Description:

Too many DirectionsWaypoints were provided in the DirectionsRequest. 
The total allowed waypoints is 8, plus the origin and destination.