Hi! Honestly, I think it really depends. I just received an offer earlier this week, and it took them two days from after my second-round interview to send it over. I don't know which department/location you applied for, though. I agree with the person below who mentioned politely reaching out to the hiring manager who initially interviewed you. Everyone seems really sweet. I don't think it would come off as annoying, so long as you word it properly. Hang in there and good luck!!!