Bargello and Medici Chapels open until 5pm
Starting April 1st, these two museums have extended their opening hours.
The National Museum of the Bargello and the Medici Chapels, two of the lesser known but most appreciated museums in Florence, are now open until 5pm (they previously were closing at 2pm).
These extended hours will be guaranteed until November 4, 2018. I believe they will see whether more visitors will show up in the later afternoon hours to decide whether to keep them or not.
To better plan your visit, checking opening days (especially since they both alternate opening/closing on Sundays and Mondays throughout the month), check the pages dedicated to the Bargello and to the Medici Chapels.