The answer to your question is dependent on where you're departing from.
it would take approximately 10 hours
how long will it take a small boat from england to Greece
2 to four hours!
542 days
It would take 10 hours for a typical flight from Greece to Connecticut, if the stopovers are neglected.
A flight from Greece to Rome, Italy would take about an hour and a half. There is approximately 540 miles between the two locations.
It depends: 1 - Greece is a country. The time it will take will depend on from where in Greece you are setting out. 2 - How are you travelling? By plane, you're probably looking at an hour or two. Walking would take a lot longer.
Too many variables, but most importantly we do not know the starting point.
Roughly 5 hours
18 hours
5 hours
11