Upgrading plan after final payment

[12disneybee]

My trip starts 9/6, If I were to want to add another person (villa can accimodate 8 and right now we have 6)and upgrade from TS dining to DxDP, what's the latest day to do that? Thank you.
Does anyone know a link that I can find this answer that is official by Disney? Thank you so much in advance.

 

[DisneyHardin]

Don't take this as gospel truth, but for some reason 5 days is what I am thinking for dining plan changes.

 

[dansdad]

My trip starts 9/6, If I were to want to add another person (villa can accimodate 8 and right now we have 6)and upgrade from TS dining to DxDP, what's the latest day to do that? Thank you.
Does anyone know a link that I can find this answer that is official by Disney? Thank you so much in advance.

You would have to upgrade at least 3 days before you check in.