iOS 13- By default it is set to Manually, but you can
change it to After One Day, After One Week, or
After One Month.
There’s no correct setting, just choose whatever
makes sense for the way you use your iPhone. I find I
almost never need to reference something more than
a week old, so the After One Week setting keeps my
open tabs to a reasonable number without impacting
my daily use.iOS 13
4.BydefaultitissettoManually,butyoucan
changeit toAfterOneDay,AfterOneWeek,or
After OneMonth.There’snocorrectsetting,justchoosewhatever
makessenseforthewayyouuseyouriPhone.IfindI
almostneverneedtoreferencesomethingmorethan
a weekold,sotheAfterOneWeeksettingkeepsmy
opentabstoareasonablenumberwithoutimpacting
mydailyuse.