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Around 15C or higher, 2 minutes is about my lot. Below 10C 3 and 4 minutes become practical, below 5C the darks are almost completely clean.
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Wow ! By my side I never have less than 30C. Normally I work with 35 - 45 C. Few times I must work with 45 - 55 C. Umidity never less than 50 %.
Perhaps this is the reason to use ISO 400 and subs with 4 minutes, or ISO 800 and subs 3 minutes. Never more ISO. The time of exposition is because of sky glow.