FWIW, they never announced the Grade of Giannis' sprain but a handful rumored it to be Grade 2, which has a 3-6 week timeline. It's been 3 weeks since his injury.
IF Porzingis does have Grade 1, that means it could be 1 to 3 weeks MAX which could even mean he can return during the 2nd round (best case scenario). But I'd play it safe regardless.
I can't imagine they'd report this and say it on the injury report if there was actually an Achilles tear or something more serious. We may have dodged a bullet, KP should be back at some point UNLESS we somehow get bounced this series or next round.