I have been doing this for many, many years and run a website on the subject. Yet I have no idea what an SWU is.

I do not like the jet lag problem flying to Europe. So I usually fly to another city in Europe, enjoy that for a few days (usually a walking tour to keep me awake), then fly to where I want to to go. Example: San Francisco to Zurich, 2 nights there (free at a Holiday Inn Express), with a ferry trip down the Rhine between those two nights. Then a flight to Dubrovnikfor a 2 week tour. Return from Ljubljana.