480MBit/s is fast enough that you do need to worry about best practices and impedance matching within 10% or so. Many MCUs will also need series resistors between the USB PHY pins and the connector.
Will you need to respin a board because you needed to use a 20 mil trace instead of 24 mil? Probably not. All things considered, laying out a USB 2.0 differential pair is pretty low stakes. But you should still try and do it right - it's good practice.
Will you need to respin a board because you needed to use a 20 mil trace instead of 24 mil? Probably not. All things considered, laying out a USB 2.0 differential pair is pretty low stakes. But you should still try and do it right - it's good practice.