Portland is 9 hours behind Vienna
Best overlap: 5:00 PM to 6:00 PM in Vienna is 8:00 AM to 9:00 AM in Portland.
Book within 5:00 PM to 6:00 PM Vienna time (8:00 AM to 9:00 AM in Portland) and both teams will be at work. The overlap barely stretches to 1 hour, so reserve it for what really needs a live conversation and handle the rest async.