A comparatively long time.
Existence without end, infinite time.
A period of time which extends infinitely far into the future.
The remainder of time that elapses after death.
Existence outside of time.
A very short, unspecified length of time.
The time taken for light to travel a specified distance in a vacuum, usually one centimetre, but sometimes one foot or the width of a nucleon.
A unit of time defined by the frequency of its basic timer – historically, and by convention, 0.01 of a second, but some computer operating systems use other values.
The length of an alternating current power cycle (1/60 or 1/50 of a second).