Changes will show 24hours late

Hi,
We have a multisite using your plugin.
Now the problem is. If we add or change something on the website. It will take to 24 hours to show the change at the front at the right domain. How can i speed this up?

The problem happens on partner.detuinmachineshop.nl/mabelis and the domein is: https://mabelismechanisatie.nl/