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Remember to maintain the temperature at just below 350 farenheits for the duration of the process.

Maintain the temperature for the duration of baking to achieve the best results.

Are they correct?
Thanks.
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Remember to maintain the temperature at just below 350 degrees Fahrenheit for the duration of the process.
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The second one somehow sounds redundant, since baking includes duration and temperature. "While baking" means for the duration. I"m not sure exactly what bothers me about your sentences. "Process" seems too technical (trust me, I know baking can be extremely technical) but here it seems like "the process of washing the dishes/taking a shower." (I know both are possible.)

For best results, maintain the oven at an even temperature not exceeding 350 f.

There's nothing wrong or incorrect with either of your sentences.

- A.