This was previously asked by others in the Answers hub back in October, I’m reposting as it’s unresolved:
The service interval attribute on BT services doesn’t actually seem to do anything! Try creating a service which just prints a string, no matter how high you set the tick interval the service continues to print a string every ‘real world’ tick, i.e without using the prescribed interval at all.
An older thread from answers hub: Service node interval not working as intended? - UE4 AnswerHub
My services are blueprint based so I’m not sure if few of us have found a bug that only affects Blueprint based services. I’m currently mitigating this by forcing a delay inside my service to my desired interval size but obviously that’s a crude workaround.
PS: I’m able to reproduce this in both 4.5 and 4.6 preview