The Pompeii excavation ticket office opens at 9 am and to visit the archaeological site, you must calculate at least 2 hours. For excursions from cruise ships when it comes to an Amalfi tour from Naples, it is advisable to leave at least at eight in the morning and visit Pompeii in the afternoon before going back on board the ship. Pompeii is only 20 minutes from the cruise terminal, ... https://www.naplesdriverguide.com/tour-category/pompeii/