Stiff Starter Sourdough (from the book Crust)

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Hey everyone, I’ve tried making the following recipe according the book Crust but I’m wondering if I can make this in a day, without the overnight proof. My kitchen is currently between 22-24°C. Can anyone suggest how long should I bulk ferment and final proof for now (almost spring here in Canada) and when it’s summer. Thank you. :)

Makes 2 large loaves

90g spelt flour 

700g strong whiteflour 

400g starter (50% hydration) 

650g water

20g salt

It depends on how active your starter is. For this amount of prefermented flour (25%), I'd say at least 3h bulk and maybe around 2 h final proof. If you remember what the dough felt like when you've made this previously, you could aim for that.

I got my settings wrong here and didn’t see this. 
my stiff starter (he’s called Etno) is refreshed 20:40:20 (s:f:w). This is so easy to maintain. It rises like a lil bun and I could convert it to a 100% if I wanted to or just tear it into pieces to make a levain of any concentration or add it to a recipe - just have to calculate the hydration of the final dough a little. I keep all my starters in small quantities and their discards in a jar for other recipes. 

I made this according to Bertinet’s book but this link shows the same: https://www.bonappetit.com/test-kitchen/cooking-tips/article/starting-a-starter-for-winter-sourdough-bread

In a day without overnight anything, yes. Tweaking the fundamentals can give bread in 6 hrs, or less. How long for each step - till it's done, nothing different there. Enjoy!