Hi L2C, I'm sorry to say your info looks correct. According to their website they are open Tuesday through Sunday 08:15 to 18:15, but it may be worth emailing them on firstname.lastname@example.org in case this is a seasonal thing.
Last Cruise: Minerva April 2015
Next: Royal Princess August 2015
Then: P&O Oriana October 2015
and : Queen Victoria January 2016
Just want to let anyone know that is planning to see The David in Florence -- if you are there on Monday, the museum is closed. It is closed every Monday, year 'round. Just received a reply from the secretary's office about that today.