From my experience, it took a few weeks before my additional certification showed up as “verified.” If you’re certification is though one of the major agencies (i.e. ACE, NASM, ACSM, NSCA, etc.) I’d imagine it shouldn’t take any longer than that.
If you’re especially concerned, I’d recommend calling IDEA at 1-800-999-4332.
that depends on the organization. My certification with NASM was verified within days.