EY offer letter

Hi everyone, i gave EY last round interview and got a mail next day to fill out candidate information sheet termed as virtual onboarding. Next day (i.e. satuday) i got a call from HR for salary negotiations ,then he said i will send your candidature for approval, it's been 1 week i.e. 8 days (today's monday) but i haven't recieved the offer letter yet. I mailed them but they responded that approval's in progress. How many more days would i need to wait?