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"up until" is a compound preposition that means the same as until, as in We can stay until [up until] Thursday. Limit it to Conversational and Informal and Semiformal use, and let context make clear the relation (if any) to bedtime; until by itself is more appropriate in most Edited English.
extract from "The Columbia Guide to Standard American English."
not sure whether it is authorized enought or not, but I think "up" is redundant with until.
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