Even the 24hrs is fuzzy, I conducted a "Fishing expedition" a few weeks ago
Seperate PNR's
Flying ORD-XXX at roughly 11am on day 1
Day 2, I was flying XXX-Int'l on Polaris, but the flight left XXX at 10am, but the polaris flight left at 5pm, but i had checked in for both flights

I went by the Polaris lounge at 09:30 to see if I could get in - no dice (I told the attendants what I was doing)
Came back at 10:01am and tried again and was granted access

But, I had to book it as I was leaving from B25ish and had a long walk