The /sitecore/system/Tasks/Schedules/Apsis Synchronization item controls how often segments are synchronized with APSIS One. By default, your segments will sync every 5 minutes:
Note that the synchronization interval cannot override the frequency set on the global Sitecore task runner. You may need to adjust the frequency in the Sitecore configuration file. Locate this option in the frequency section in your file, as shown below:
About Frequency Settings
In this example, the frequency is set to every 10 minutes. The default settings vary between Sitecore versions, so it's a good idea to coordinate your Sitecore frequency setting with your segment sync interval.