new runner ran mile almost entirely in lane 3

my brother just ran his first high school race as a freshman, with basically 2 weeks of hs practice. He clearly wasn’t coached as he stayed in lane 3 for the first 3 laps, running next to two (smarter) teammates. I told him that probably cost him at least 10 seconds. Oh and he ran a 4:54 which I think is incredible since he’s never run track, but no one else really thought it was a big deal 😠. Anyone know the math on how much time he lost running two lanes out from lane one?