by Andy W » 14 Oct 2015, 05:54
All anyone can do is guess based on this year.
Times vary according to the day of the week.
At the best you could leave Rhodes at 08:30 and get to Symi at 09:20. Leave Symi again at 17:35 getting back to Rhodes at 18:30.
These times operated on Fridays,Saturdays, and Sundays. Boats ran daily but on other days there was less time on Symi.