My confirmation indicates "Rules & Conditions" which include "A Minimum of 5 Day(s) will be charged." and also "The Minimum Rental Duration is 5 Day(s)." This is on a reservation for 5 days and 2 hours (which qualifies for a weekly rate). Price estimate includes 6 days of FL surcharge @2.05/day and FL license fee @0.41 per day.
I had a weekly rate reservation (again for what was barely 5 days to qualify) in January when our arrival at MCO was delayed about 6 hours. When we returned the car, the rate was reverting to a much higher daily rate, for what was now only 4 days worth of rental. This was adding about $70 to the bill! Yikes, the difference between daily and weekly rates can be really significant. I had to go to the Counter and try to straighten this out. I explained to the counter person that we had spent the entire arrival day waiting around O'Hare Airport and that it was really out of our control that we arrived and picked up the car so late. We were returning it right on schedule. Fortunately, she took pity and worked out the daily rate so that the total for the rental period matched my printed confirmation. She had to change the daily rate being charged, since she could not get the computer to accept a weekly rate for the shorter rental period. That confirmation also indicated a 5 day minimum, so National had every right to charge the higher rate.
Ralph