Changing from one die to another is 6-10 seconds and the dies stay adjusted. I'm not sure what a turret buys you if you can change dies that fast.
It's not just a matter of how fast you can change dies. It's a matter of how much you have to handle the brass.
With a single stage press, it's pick up the cases one at a time and form and prime them. Then you have to handle each one again to charge and seat the bullet.
With a turret, you pick up a case, pull the lever once to form, and push it once to prime. Then the turret indexes forward to the charging station, and you charge, etc. The brass never leaves the press until the cartridge is finished.
It's a lot faster.
