Check-in time limits
 

I am travelling from Barcelona to UK on Iberia and wanted to inquire if anyone knows how early one can check in for the flight? I have a tight meeting schedule and was hoping to speed things up by checking my bags, heading to a meeting, and returning just prior to my flight. Do you think I can do an early check-in (4-5 hrs pre-flight) to accomodate my schedule. Am concerned I may miss my flight (hence a connection to JFK from Heathrow) if I am late for the flight.

Thanks, Nancy