I am trying to add an event every 6 week, that is 2 week long, but that is not possible with this calendar. Is this a bug or is there any other way to have this event into the calendar?

We specifically prevent you from creating recurring events on a daily basis if they last longer than a day, weekly if they last longer than a week, and monthly if they last more than a month. The problem was that some clients would have a daily recurring event every other day that lasted 3 days, which resulted in problems with trying to generate and determine which event occurrence was happening (technically 2 could be occurring at a time).

In other words, it's a limitation intentionally in place more so than a bug.

31 minutes ago, bfarber said:

In other words, it's a limitation intentionally in place more so than a bug.

OK thanks. That explains. I work 2 weeks and have 4 week vacation so I was trying to get that into the calendar. I managed to make a recurring event for one week at the time so that would work..