Your trip to Sifnos starts at Peiraias and takes between 2.5 hours if you use the High speed ferries (catamaran) or up to 5.5 hours if you use a normal ferry.
The trip is very enjoyable as usualy in the mean time you can see also the islands of Kythnos and Serifos.Also you can have a little stopover to one of those islands mayby for a day on your way to Sifnos.
The ferries during summer period are very often and the boats are sailing either early morning or after lanch.
A beautiful alternative way to come to Sifnos is by a charter boat. In Athens you can find lots of Greek companies offering charter boats at very temting prices.
Check ferry time table
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Sifnos is also a fantastic place to spend your hoidays, and to use the island as base for short day trips to surrounding islands of Serifos, Milos, Kimolos, Paros.