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".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