"What are the signs of a perfectly ripe starter? It's very bubbly, and is reliably doubling in size within 6 to 8 hours of feeding. "

I've read this rule of thumb (double in ~6h) in several places now, but does it not also depend on temperature ?
It is often suggested to keep the starter between 70F and 75F. So, should a healthy starter double in 6 to 8 hours at the lower end of that range at 70F the same way it does at 75F ?

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