Waste of time/money it's too far for a daytrip, it's 5 hours there and 5 hours back, half of that time on an expensive fast ferry, and half on a coach. 14 hour day for 4 hours in Athens, so pointless.
Look on a map you'll see just how far away Athens is.
As you seem to be from the UK much cheaper to use Easyjet from UK ... and it's quicker ....
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