There is no such thing as a "scheduler issue" in JIRA Core (or JIRA Software for that matter, and though I'm less familiar with JIRA Service Desk, I haven't heard of it existing there either). Is this in reference to something provided by the TheScheduler plugin? If so, then you should indicate that in your question.
In any case, you are correct; it is not possible to set an interval of 11 weeks using a single cron expression, as cron expressions work kind of like regular expressions – they represent a pattern and the job executes when the current time matches that pattern.
Plugins can also schedule interval jobs, so if you currently only see cron schedules offered, perhaps you can ask the plugin developer to support interval schedules as well.
If you spend enough time as a Jira admin - whether you are managing a single, mid-sized instance, a large enterprise one or juggling multiple instances at once - you will eventually find yourself in ...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
We're bringing product updates and pro tips on teamwork to ten cities around the world.Save your spot