WordNet (r) 3.0 (2006):

time lag
    n 1: time during which some action is awaited; "instant replay
         caused too long a delay"; "he ordered a hold in the action"
         [syn: delay, hold, time lag, postponement, wait]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "time lag":
   afterthought, bind, block, blockage, bureaucratic delay, day,
   delay, delayage, delayed reaction, detention, double take,
   dragging, fateful moment, halt, hang-up, hindrance, holdup, hour,
   instant, interim, interval, jam, juncture, kairos, lag, lagging,
   logjam, minute, moment, moment of truth, moratorium, obstruction,
   paperasserie, pause, period, point, pregnant moment,
   psychological moment, red tape, red-tapeism, red-tapery, reprieve,
   respite, retardance, retardation, season, slow-up, slowdown,
   slowness, space, span, spell, stage, stay, stay of execution, stop,
   stoppage, stretch, suspension, tie-up, time, wait, while