Very long brewing times

I have been experimenting with brewing green tea and even some blacks at much lower temperatures and for longer times.

I have read here about sun brewing and even refrigerator brewing.

Is there a table anywhere that shows optimum (or maximum) brewing time as a function of temperature? I realize everything is subjective, but recommendations are already given for the recommended temperature. I am wondering if there some general way to convert the brew time when using cooler water.

For example, is there a table like this or could one be constructed?

Temp Time

Thanks

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