Mega Drive inn Hyderabad conducted by EY GDS

Did attend the mega walkin Drive conducted by EY in Hyderabad location. Was told that I’m selected and a couple emails were sent, I have submitted few documents(Aadhar, Candidate form, Resume) and I didn’t get any other response further. I’m waiting for offer letter so that I can resign in my current org. Can anyone know how much time it will take for us to receive offer letters? Few of them did get offer but they are of different role.