We've never had to wait over 10-15 minutes. Most of the time, they are waiting for you and you barely have time to get a red stripe. Extremely efficient transportation system they have. On the return trip, they take people based on their departure times. Here again, very efficient.
The wait time is not long, usually less than 30 minutes after arrival at the Couples Lounge. It seems that they are not on a schedule but leave when they have people to go to CSA and CN.
Return to the airport is by departure time and they will let you know when the bus is leaving the night before so you'll have plenty of time to get ready before it's time to leave (the saddest part of the trip).
I am not certain how they do the shuttles to the resort, but we have waited 10 minutes to 15 minutes max when we get to the l0unge. Really mostly just enough time to get a beverage, use the bathroom (which is located in the lounge for Couples customers only), maybe get a second beverage and off you go. In 3 trips all to CN, we have had a total of (counting ourselves) 6 - 8 - 4 people on the shuttle not counting the driver and they hold probably 24 or more. Going back, you will probably leave 4 hours before your flight, and that shuttle is usually fuller then the one you arrived on. And everyone is sad. Will be doing the shuttle routine ourselves in 27 days, 20 hours and 43 minutes not that I am counting.
We have never waited longer than 15 or 20 minutes for our shuttle van to the resort .... We have time to go to the restroom (Couples Lounge has their own) & get a Red Stripe, a Diet Pepsi, or a bottle of water from the bartender there & you're on your way. They don't really wait for a certain # of people .... It's been only us & it's been several couples but normally is us & 2 other couples going. For the trip back to the airport, you will receive the info under your room door a couple of days before your check out with what time to have your luggage out & what shuttle you'll be on ..... Uusally, you'll be on the shuttle that leaves about 4 hours before your flight ..... Our flight is always at 3:30 & we are on the 11:15 shuttle ..... Make sure to have your sunglasses on so noone will see you crying on the way back to Mobay ..... I HATE that Good-Bye Bus !!!!! Booked at CN for trip #11 .......