Miami is 6 hours behind Oslo
Best overlap: 2:00 PM to 6:00 PM in Oslo is 8:00 AM to 12:00 PM in Miami.
2:00 PM to 6:00 PM in Oslo is when Miami is also working, at 8:00 AM to 12:00 PM their time. You've got a decent 4-hour window. Set a recurring time near 2:00 PM in Oslo (8:00 AM in Miami) and stick to it.