After the CAD and CAM, to set up and and begin the cut (if you were an expert) would be less than a minute. More likely a few minutes to make sure you’ve got everything in order.
I just made an ‘A’ in estlcam and did it in two passes at 8mm/s and the estimate from EstlCAM was 7 mins. I have found that to be a bit short, so I would guess 10-12mins.
You can follow the Cam basics tutorial and try some stuff out yourself. You’ll figure out quickly what matters w.r.t. speed. Things like getting 2 cuts instead of 3 or avoiding pockets will help a lot more than a few extra mm/s.
The CAD and CAM is where the real time is for me. I easily spend 2x the time in CAD/CAM than I do at the machine.
If you were making 'A’s by the dozen, with the same gcode file, you could easily get that cut down and be making one every 10 minutes.