How should the indicated waiting times be understood?

The specified waiting time must be added to the time of the next departure.

Example with half-hourly service: Your arrival at 11:15 AM – next departure at 11:35 AM – specified waiting time 30 minutes – the earliest you can load is at 12:05 PM.

Example with hourly service: Your arrival at 11:15 AM – next departure at 11:35 AM – specified waiting time 60 minutes – the earliest you can load is at 12:35 PM.