I did Bristol - Moenchenglattbach and back followed by Bristol - Frankfurt (Egelsbach) and back. The last one I did on my own. Prefer two up except you can not take any luggage. It took me 6 hours one way. Loved it.
I have no problem flying long distance in the R22. But I would love to take something like an EC135 or A109 or Bell430 round the world if I can find the money.