Fill a glass bowl or cup with room-temperature water, and drop a small scoop (a teaspoon or less) of the starter into the water. If it floats, it's ready to use. If it sinks, your starter will need more time to develop, either with another feeding or simply more time to sit and develop air bubbles.

How long after feeding is sourdough starter ready?

Generally, about 5-6 hours after feeding my starter is ready. The time may vary based on room temp, dough temp, etc. The starter should have doubled in volume and started to recede and/or pass the float test. I take my starter out of the refrigerator once a week for feeding, even if I'm not baking.

How long do you let sourdough starter sit?

Let it rest at room temperature for about 8 to 12 hours, until bubbly. Repeat as necessary, every 12 hours, until you notice the starter doubling or tripling in volume in 6 to 8 hours. That means it's strong enough to leaven bread.