Generally, support can be reached from 8:00AM GMT+1 (daylight savings in summer GMT+2) to 5:00PM per email, better by using Jira Service Desk.
Each of our products have got a published link to a JSD portal for customer service.
Our issue tracker is available 24h * 7 days.
On German holidays, we are not reachable, but will take care shortly afterwards.
Response time expectations are generally within 1 - 2 business days.