Hi Niels,
In the community commons there is a refreshClass method which can refresh the entity displayed in the List https://appstore.home.mendix.com/link/app/170/Mendix/Community-Commons-Function-Library
Combine this with the timer widget from the app store and you are all set https://appstore.home.mendix.com/link/app/27/Mendix/Microflow-Timer
Hope this helps,
Andrej