Yeah but you can’t “fail” Indoc so leaving in the first week would just be a little red flag and not a big one.
Regionals seem to be a revolving door.
Personally I’d do at least 6 months to remove any suspicions.
And even then it would need to be the offer of a lifetime or a logical career step that just came earlier then you expected.
What’s so much greener on the other side?