I used a single stage press for about 8 years before I got a Lee Classic Cast Turret.
The turret is AT LEAST twice as fast as the single stage, and maybe 3 times as fast.
I still use the single stage for small batches.
Your Lee would be slower since you will have to adjust the dies every time.
Not true. You adjust the does once when you put them in the turret, and that's it. Never again. JUst buy a $12 turret for each die set. Then you change the whole set of dies in 5 seconds. Quite speedy.