It can’t b guessed so accurate but in my case status changed within 4 days of actual submission of adr docs requested ... status changed from docs required to docs received then to docs under review then to not applicable within 4 days ...
but also it had been seen in some cases that ppr arrived within 2 days even the same day if status of adr changed after like 2 months...
so it is very hard to predict actually..
one thing is that ur status will change to ip2 before ppr
one thing is that ur status will change to ip2 before ppr?? Not sure about that!! I have read people's profile that got PPR with Background saying "In Progress".