The last time I did a partial Panama it was 14 days with 5 ports and the canal...I thought 8 days was cutting it fine...but it could be shortened to 7 days by dropping a port...the ports might not be open anyway...
For years now various Carnival ships did the canal from Tampa.
Yes, I’ve been on the 14 day one. The shorter ones were all 8 day. Never saw a 7 days one, but logic suggests 7 days ‘could’ work.
Did the Miracle in Dec 2018. Tampa, Cozumel, Costa Rica, canal, Cartegna, Aruba, Curacao. Cayman, home. Got a deal won’t ever see again. Unobstructed balcony for 14 days for $449 p/p