Hi Partrick,
You need to change the SCHED_Duration attribute on the schedule. So, create the schedule for 590 hours. In the locater tab, run the “Schedules -> All Schedules” search. Select the schedule you just created for 590 hours. Go to the Attributes tab, and change the SCHED_Duration to 7776000.
When you go back into the Add/Remove Schedules, you’ll see it now shows 2,160 hours (90 days).
That should do the trick.
Cheers
Jay