Doubt Regarding Microsoft Entra App Registration Client Secret Validity Duration

So the doubt i had is, say suppose if the client secret of my app registration is about to expire in the next 10 days and if i renew it by creating a new client secret in the azure portal before the expiration date , since i will be using it in my application code will my application go down if i dont update it with the new client secret as soon as it got created or will not cause any issue as the old client secret is not expired yet and i can update my application code with the new client secret before the expiration date of the old secret?