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How long does it take service to replace MCU2 units if in stock?

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I'm trying to plan some immediate travel as early as tomorrow, but I have a Tesla loaner because my 2018 75D is in the shop to have the MCU replaced (borked BT during sw upgrade). They mentioned they thought they had the part in stock and then I got a text right at their closing time of 5pm that it is now in progress. I'm afraid I'll be gone a few days and get a call tomorrow that it's ready and then I'll have to figure out how to get the loaner back ASAP. Anyone know if it takes more than a day to replace the MCU? I'm guessing it doesn't.

EDIT: I see now that the app is showing estimated completion at 4:45 tomorrow. Grrr....odd to want them to keep my car a bit longer, especially since the loaner doesn't have AP or my HOV sticker :)