If you manually turned on 2FA in your Instagram settings (which is highly recommended), you will need a new code every time you log in, roughly every 30 days, or whenever you use a new device.
Leo stared at his phone, waiting for the six-digit code that would let him back into his Instagram. He’d been locked out for three days—three days of digital silence while his friends posted photos of the "trip of a century" in Tokyo. The notification finally chimed. 8-2-1-9-0-4 6 digit code for instagram