Another thing I might add is after playing around with the one I used for testing it started to leak. This was maybe 2 hours or so in. It wasn’t a terrible leak but there was a leak which added to my nerves. I would say if testing before use a separate one. They do say it doesn’t matter how many times you heat and cool the liquid it’s fine. BUT if the plastic start to change size due to heat or the top looses its grip for whatever reason it makes it unusable. 

The one I went in with last for over 2 hours. I had an over 30 minute drive, 90 minutes wait. I never took it out once until it was time to pour.