Disclaimer: When you are speaking to a women in terms of one beers time you need to multiply your number by approximately 5.
My friend: I don't know, about "one beers time".
AKA: We've been here for a little over an ten minutes.
Me: How long have we been at the beach?
My friend: I don't know, about five beers time.
AKA: We've been here for about an hour.