Type Function Library timer.* Return value Number Revision 2017.3060 Keywords timer, pause, resume See also timer.resume() 
timer.performWithDelay()
Pauses a timer started with timer.performWithDelay(). It returns a number that represents the amount of time remaining, in milliseconds.
local function listener( event )
    print( "listener called" )
end
 
timer1 = timer.performWithDelay( 2000, listener )  -- wait 2 seconds
-- sometime later...
local result = timer.pause( timer1 )
print( "Time remaining is " .. result )