Letting it sit too long can cause over-proofing and can compromise the final texture of your sourdough bread.
SAM’S TIP: I recommend proofing your dough in the refrigerator overnight rather than baking right away (I also provide instructions for baking right away, though). Proofing overnight will help develop the flavor, help the bread rise better, and encourage more fermentation. That being said, I don’t like to let my dough sit in the fridge for longer than 48 hours (absolute max) before baking. Letting it sit too long can cause over-proofing and can compromise the final texture of your sourdough bread. I also don’t freeze my dough before baking, so I can’t advise on that.