No-Knead Sourdough Bread in one day?

Usually I just leave it at room temp for 8-12 hours, depending on the temperature/amount of sourdough. Then let it rise again for an additional 1-2 hours. So yes, it's possible. Fridge time is not necessary, however I heard it gives better flavors amongst other various benefits, but I've forgotten :P 

SD bread in a day if your starter is refreshed the day the before so kn knead can probably be done in a day - starting at sunrise and finishing at sunset......

by adding a higher percentage of starter and doing a couple stretch and folds to the dough.

Yes, you can do it all in one day.  I just made one of my best SD loaves ever with the following technique:

• Feed the levain the evening before (I fed it dark rye flour)
• Autolyse the rest of the flours first thing in the morning, 8am-ish.
• After 30 minutes or so, add the salt, mix/knead briefly, then cover and place outdoors where it is chilly (5° C) but not as cold as a fridge.
• That afternoon, fold the dough once.
• Around supper, bring the dough inside and shape the loafs, let rise for another 90 minutes or so.
• Bake around 8pm.
• Remove from oven, place in a cloth or paper bag and allow to cool overnight.
• Slice the next morning.

The link below is to a recipe for the best no knead or kneaded bread I have ever made; and I have made bread many ways over the last 20 years. 

This is a high hydration bread that you just mix, let rise, dump into ceramic bowls, let rise a second time, and bake. Whole process takes about three to three and a half hours. I was sure this would not work. But, I've made it five times and it's been great every time. On one of those occasions I scooped the dough out of the bowl with an ice cream scoop and plopped the dough into muffin tins to make dinner rolls. Worked great.

Give it a try. You will be surprised.  

http://www.alexandracooks.com/2012/11/07/my-mothers-peasant-bread-the-best-easiest-bread-you-will-ever-make/

You are right. I missed the sourdough theme of this thread. Just shoot me.