Laughter is bliss.

A long time ago; at some time in the past (a traditional beginning of children's stories, especially fairy tales).

(aviation, travel) The amount of time, agreed in advance between airlines and airport authorities, that is considered sufficient for a passenger to make a connection between an arriving flight and a departing flight on the same ticket.

(Britain) A time signal transmitted on radio by the BBC every hour and consisting of five short beeps followed by a longer one, with the longer one coinciding with the start of the hour.

Mean solar time at the Greenwich Meridian.

The amount of time within which a business process must be restored after a disruption in order to avoid unacceptable consequences.

A chronological scale of the earth's history used to measure the relative or absolute age of any part of geologic time.

(idiomatic) To acknowledge someone; to give someone respect or attention; to tip one's hat

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

(idiomatic) To remain useful or valued over a long period of time; to last a long time.