How long does concrete need to cure in order to reach 90% strength?

For getting 90% strength it should be cure for 20 days.

As we know that concrete attains 50% of its design strength when it cured for 3-7 Days.

75% of Compressive strength achieved in 14 days 90% of strength by 20 days as time goes on the strength increase gradually.

And 99% of strength by 28 days.

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