[He takes his mug and holds it in both hands, looking down into the steaming, brewing liquid like it will hold a better answer than the truth. While he's waiting for that inspiration, he notes:]

You didn't really lose all that much time, then. That, ah-- well, let's call it that stage persisted for a few days, overall, and then the outcome you were dreading came true: the ship did, in fact, turn itself inside out, thanks to the portal. And that persisted for about a week, along with the spell, so you'll only have been out for about a week and a half.