Average Rate Heat Incrementally Increases

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What is the Average Rate of Heat you allow your run to Increase during which times?

I see a lot of formulas, and calculations others saying low heat, high heat, or that you increase, and decrease heat accordingly. As a newbie, this is and can be confusing, and as designs, dimensions, ABV can all affect the overall outcome of your success, this leads to more questions, concerns etc.

simplify this the best you can no math, simply how fast do you allow your unit to heat. 1°F/C per x minutes.

I know some use thermometers - do you increase/decrease, and at what is the average rate you allow your heat to increase.

I know some don't use thermometers - how do you judge your heat, and "do you increase/decrease, and at what is the average rate you allow your heat to increase."

Also let me know the dimensions, and setup of your unit.