Jun 4, 2018, 17:0106/04/18
I assume you do this - return the galleys - to execute the so called galley-trick so you can raid up to 100k.... So the reason it will cost you drachmas, is you being too slow.
I am not 100%.. I read it somewhere here on the forum.. I believe it was 45-50 sec you can recall the galleys with no cost.