Using RVUs, hitting 250k is 6250 wRVUs assuming the nationwide median of $40/wRVU. Assuming a 4.5 day work week (which is what that post described) and a 46 week year (basically 6 weeks but including holidays in that), you end up needing 30 wRVUs/day. If you're averaging 1.25 wRVUs per patient, that's 24 patients. My billing is closer to 1.4 per patient so more like 21-22 patients/day. If you schedule 20 minute visits and 2-3 40 minute physicals, you'll hit that with a fairly easy schedule (most offices use 15 minute visits and 30 minute physicals, which means you can have several open slots and still hit that RVU target).
That number is likely lower if its pure collections, assuming a halfway decent payer mix.