Yes the length of the journey is the main reason that I'm not returning to Symi for a week next September. For 2 weeks it's not too bad but I only had 6 nights on Symi and arriving home at 6am in the morning after being up all night isn't ideal. I've booked a flight to Chania flying from my local airport for September 2017 and will spend a week exploring parts of Crete that I haven't visited before. When I return to Symi it needs to be for 2 weeks as a week just isn't long enough.
Glad you enjoyed your week on Symi Irene