There is no information regarding minimum/maximum stay durations, but any layover in Lisbon/Porto cannot exceed 5 days. You will need either a U.S. visa or ESTA to enter the USA (charged at $14 per person and you must arrange it prior to departing).
Flying from: Prague
Flying to: Miami
Airline(s): TAP
Luggage: Handbag
Travel period: late October 2020 to May 2021 (excl. Christmas)
Book by: Unknown
Booking sample
Prague – Miami for €297 (booking with TAP)
Booking sample of cheap return flights from Prague to Miami from €258! As per our booking your outbound flight from Czech Republic to Florida would be on the 16th of January. Inbound from the U.S. state of Florida back to Czechia on the 31st of January 2021.