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Depending on what mix design used relative psi strength should be met within a 27-32 day period. The only timeframe the finish typically changes is within the first two weeks, but it also depends on how it was finished. Floating and hand troweling will end up whitening in the same matter sidewalks and aprons do with a broom finish, machine finishing then spraying with a curing compound will typically leave it closer to its natural dark color if left unexposed to sunlight...ie homedepots , cosco, etc typically have that kind of finish work.
There is no added benefit to waiting longer,and if it's exposed to elements it kinda just dirties it up more so then anything.
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