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as soon as no later than the time that, or immediately after the moment that.
as soon as possible within the shortest amount of time possible.
would just as soon used to indicate a secondary preference if a first option is not available, or a preference that may not be or may not appear to be highly desirable but is still more acceptable than the other option or options that one is given (usu. fol. by an infinitive without "to" but can also be followed by a noun).