Found this interesting, but apparently there's a good chance if Boston wins their series in 5, that Game 1 of Philly-Boston could be next Saturday. Woj was saying this on a podcast when discussing Embiid's injury and timeline for return.
Saturday feels pretty early, especially considering there'll likely still be a lot of series still playing a 6th game (or a Game 7 next weekend). Of course, if BOS goes 6 or 7 games with Atlanta, then it's probably next Monday as planned