I make complicated quilts with small pieces and work on three at a time. I sew nearly every day.
The process is what brings me joy, the idea of finishing 50 quilts a year flummoxes my brain, why not buy a blanket?
If you are talking quilted and bound sometimes none. I make double sided quilts so when I have pairs that make me happy they get finished, so some years I might get 3 (6) finished
Obviously I haven't got a clue!
I have my speed setting on the machine a slow-ish medium, maybe that makes me a slow-ish quilter