Someone Introduces Himself to You at a Party,and Then You

Multiple Choice

Someone introduces himself to you at a party,and then you go across the room to get drinks for the two of you,and you don't think about the person's name.What is the maximum amount of time your trip to the bar could take,so that when you get back to the person,you'd still know his name?

A) 20 seconds
B) 5 seconds
C) 1 minute
D) 5 minutes