Hi Rauno,
I’m afraid I have bad news because that is not possible at the moment.
Having multi-day events span days in Month View instead of repeating themselves in each day is something we really want to do and that we’ve actually started work on. In fact, we have an open feature request that you can add your vote to and subscribe to notification for when we share updates on our progress.
Sorry for the bad news, but does this help answer your question? Please let me know.
Thanks!
Geoff