Very long sync times for team calendar in google Calendar

[Sultan]

Hi there, 

I love the feature to show our confluence team calendar entries in my Google Calendar App and Browser. 

Unfortunately if I change a time or a date in Confluence it does not change in the G Calendar App or Browser... only if I refresh the link and add the calendar again...

Does anyone know anything about that? 

It is already listed as a known issue here: https://confluence.atlassian.com/teamcal/subscribe-to-team-calendars-from-google-calendar-273285887.html 

But the link with the further information seems broken: https://jira.atlassian.com/browse/TEAMCAL-458 

can anyone help? 

thx

Sam