Yessir, end of day 20 with bobs...
Basically by dates you want the last 3 full days to be done without turning no matter what the speces is.... This gives jr time enough to get oriented and turned to the proper pipping position. I highly recommend hatching upright in some sort of tray/ holder--- this allows the max hatch rate as position doesnt matter, and it allows the maximum humidity rate without drowning the chicks when they pip. The sky high humidity(75% OR HIGHER) makes the egg shell softer and buys any slow zippers extra time before getting shrink wrapped by the egg membranes.
NOTE: YOU CAN ONLY USE EXCESSIVE HUMIDITY WITH UPRIGHT HATCHING!!!
Even without excessive humidity you will see a noticeable increase in hatch rate by upright positioning for lockdown/ hatch.