No problem, @taxxman02.  Working across states is a fact of life for many industries.  Way back when I was still with accounting firms, the dreaded timesheet was the basis for cross-state reporting and withholding.

I still think the key would be the day count but your client may well have crossed the 183-day threshold, now that we know it's his father's apartment he's staying at (if he also visited his dad in NY on his days off work).

Since he habitually stayed at that apartment and it's apparently available to him year round, there's little doubt it would be deemed a permanent place of abode.