Given a travel related situation, and given a specific question about the situation, summarize the question into a title

For a particular hotel I booked Expedia's Check-in policies section states the following:


  Check-in time starts at 4 PM
  
  If a late check-in is planned, contact this property directly for their late check-in policy.


My question is...  what constitutes a late check-in? My flight is scheduled to arrive at the airport at 8:34pm.

What constitutes a late check-in for a hotel and should I inform them about my late arrival?