Start with the transfer
The port-to-city leg determines how much usable Athens time you really have. Build the day around the transfer first, then choose one major timed-entry anchor.
ATHENS · PIRAEUS
Piraeus cruise port: build the Athens day around time, not wishful thinking.
Piraeus is the gateway; Athens is the destination. The useful question is how much of the city fits after transport, timed-entry rules and a responsible return-to-ship margin.
Keep one responsible return margin
A strong port day leaves enough margin for traffic, station changes and security rather than treating all-aboard as the target arrival time.
FREDERICK · ATHENS CONTEXT
Keep the question connected to the trip.
Frederick can use this page as the current planning context, then connect live hotel or experience inventory when the traveler wants to compare options.