This is the opportunity 'of a lifetime'. = This sort of opportunity comes along 'once in a lifetime'. [=this is a very rare opportunity]
a baseball player's 'lifetime' batting average [=batting average measured over a baseball player's full career]
She was presented with a 'lifetime' achievement award. [=an award for all the work she has done in her life]
(..) to put me in jail. (stammers) This is America, right? I'm not a criminal. I'm a Medal of Honor winner a lifetime member of the New Rochelle Rotary Club. All I'm asking is for you to help me beat these guys. It's not a question of winning and losing. (..)2002 Catch Me If You Can
(..) has a history that goes back to . In all those years we've only seen a handful of deserving gentlemen inducted as lifetime members. It's an honor that, uh that has seen names enshrined on the wall of honor and tonight, we make it . So please stand as I present (..)2002 Catch Me If You Can