Q1 - When I go to what appears to be the official Venice public transportation website at http://actv.avmspa.it/en/content/prices and click on TIME LIMITED TICKETS it shows them as 1, 2, 3 and 7 day tickets. It doesn't clarify if that's a calendar day or 24 hours. If I buy a 1 day ticket at noon is it only good that day or until noon the next day?

Q2 - At the official looking site linked above it shows 1, 2, 3 and 7 day tickets available. I also found another site at http://en.venezia.net/venice-vaporetto-tickets.html that appears to indicate there is a 1.5 day (36 hour) ticket available. That is actually what I need, is that also an option?

Thanks

Pretty sure it's calendar day not 24 hours. I know for sure that the vaporetto day pass I bought a few weeks ago did not work the next morning less than 24 hours after purchase - unless my ticket got messed up somehow. Each time I tried to validate, it flashed red on the machine that morning.

The 12 hour passes have been discontinued. Based on our experience last summer, I believe that the 1 day passes are 24 hours starting with first use.

It is 24 hours. If you validate a 7 day ticket at 2.37 pm it will be valid until 2.37 pm on the 7th day.

My experience is that the passes go by the hours, and so a 3-day (72-hour) ticket first used on Day 1 at noon would be active until Day 4 at 11:59am.

In the same way, single-ride tickets are good for as many rides as you like in a set time--75 minutes.

Then I'm not sure why my day pass wouldn't work the next morning.

Thank you for the info!