(idiomatic) Used as part of greeting of two people who have not been in contact for a long time. / Used other than figuratively or idiomatically: see long, time.

Alternative spelling of longtime

(idiomatic) I (or we) have not seen you for a long time.

(idiomatic) I haven't heard from you for a long time.

Alternative form of a long time coming

(set phrase) In process, delayed, awaited, or deserved for a considerable duration of time; overdue.

(idiomatic) In politics, a lot of change can happen in a short space of time.

A reminder that we are all mortal, as a justification for enjoying life while one can.