Taron and FLY on the same day (two zen rides on FLY actually). There were almost no queues that day because it was a non-holiday monday in december and it was much colder than usual, and we got to marathon and reride the coasters many, many times.
My Taron zen ride was at park opening, of a group of 33 people I was the last one to arrive at the station and get in line, so two trains were filled and sent before I got in the next train. Op decided to wait a bit but saw no one then sent just me on the course as someone went to check if there was something going on. I later found out the screens in the entrance incorrectly marked the ride as closed for a few minutes, so people would be waiting outside. It definitely was a great ride, although later I would ride again and see how "slow" it had been.
With FLY, the two zen rides were ~15 minutes before closing the queue. The ride op kept asking if people wanted to reride without even having to get off their seats if there was enough space for people in the queue. Some people would get in, others would get off. In the end, it was just me in the front row, then one guy and I, then just me again but in the last row. After that ride I asked to get off the ride and the staff decided to close the ride for the day, as no one else had entered the queue in those last minutes. It was amazing.