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I've not measured but I'd day for me 6-12h. Depends on temp and the way the wind blowing that day. I normally feed it when I go to bed then feed it when I get up at 5-6am with warm water and put in oven with light and it's ok by early afternoon.
But I found using it at or near max rise crucial to success of loaf.
Also I reduced water content a bit from their recipe, my flour couldn't hold it and I'm at altitude.
Once you’ve fed the starter what’s the typical time to full rise?
I tend to feed to starter in the morning. Maybe I should be doing it last thing at night??