You can use the money you received on Lydia immediately to pay a professional or to send money to someone.
You can also cash it out to your bank account - it's completely free. All you have to do is tapping the "cash out" button in the app. You will have to have entered your IBAN beforehand. You just have to do it once. After that, you will never use an IBAN ever again.
You will see the money on your bank account statement within 2 to 3 days, depending on your bank's policies.