Strangely, we never ask how long a skydive lasts but this is the opposite at a wind tunnel.
We replicate the skydiving experience and offer flights which are about 1½ times longer than a tandem jump. So each flight is around 55 seconds, often a bit longer but never shorter than 50 seconds.
It may not sound long but as a first-time flyer it will seem much longer during the experience itself.