FAQ: "How long does it take for an I-140 to get approved? And, is it advisable to do Premium Processing while in Retrogression?" An I-140 is a form used by the USCIS to petition for an immigrant worker to become a permanent resident in the USA ‒ It is also known as the Immigrant Petition for Alien Worker. The I-140 establishes that the employer who is sponsoring the immigrant worker can provide the necessary job opportunity and that the immigrant worker has the required qualifications for the jo