Been on a slew of similar hop on/hop off tours. We bought a 3 day pass even thought the first day our arrival was dinner time, so we intended on 2 days.
Saw the sights, did the loop. The 3 day pass includes 2 walking tours of the French Quarter and the Garden District. The walking tour in the French Quarter lasted 45 minutes - 1 hour, covered about 200 yards, and while the tour guide, Sparkles, was a lovely lady, you get what you pay for.
We then discovered our Saturday plans got cancelled because of a planned parade, so they became 1 day passes. I still am waiting for the refund of the price difference to post to my credit card. If it doesnāt, I will have given 2 stars too many.
We booked an actual Garden District tour as a replacement, it was 2 hours, very thorough. I have no doubt the free 45 minute tour would not have been that good.