Hi @Matthias Klotz
Thanks for sharing this. I've made sure your suggestion lands on the table of our product manager for review!
Yes this would be a very useful feature - and I belive it is quite standard on other livechat platforms.
Without it, a member of the sales team has to manually turn it on and off at the beginning and end of each day, allowing for manual error in it not being turned on or off at the right time.
Just simple functionality to set 'live hours' would do the job fine.