long absent, soon forgotten

/lˈɒŋ ˈabsənt sˈuːn fəɡˈɒtən/

/lˈɑːŋ ˈæbsənt sˈuːn fɚɡˈɑːʔn̩/

used to imply that when someone is away for a long time, people tend to forget about them or lose interest in them