u/Gentle_Cat_444

Hi, I received a Congratulatory mail on April 15 saying that I was selected for the role and was asked to fill up a form while waiting for the formal offer, It has already been 3 weeks since then, I already followed up this week and planning to At least follow up once every week, Is anyone in the same situation as me? Or can anyone give an advice if this is common specially in Big 4?