We recently discovered that the end date you set in a journey does not end the journey for contacts already within the journey. So for example if you have a three month long journey that needs to end by a particular date, the end date only stops new contacts from starting the journey, but participants will continue to receive the communications until they reach the end. The only way to stop this happening is to manually 'stop the journey' before the required end date which leaves room for human error and a lot of time sensitive manual labour if you have a lot of journeys running, or MS advised us to use the email expiration date to expire specific emails in a journey, however this is not a feature in real time marketing.

It would be good if the email expiration date that exists in outbound, was also a feature in real time, but also if there was a definitive 'end date' you could set for a journey that completely expires the journey for all participants.