All visitors must present a boarding pass for a departing or connecting same-day flight. Guests can’t enter with boarding passes for arriving flights with no connection. Guests can enter up to 3 hours before their departure time.
https://capitalonetravel.com/lounges...al-one-lounges > Get the details > Show more FAQs.
AH, I didn't scroll down enough.
I wonder how people posting that they tried breakfast and lunch or sampled everything are able to eat so much in like 2+hrs (if you subtract boarding time