Environmental monitoring of settle plate method

It should be first at 32.5 C for 2 days followed by 22.5 C for 3 days.
Read page 788 of following USP chapter <1116>. You will get the answer to your both questions
http://www.ccv.com.ve/SalasLimpias/USP_1116_USP_36_NF31S1.pdf

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