At about 37 minutes, when Lily sets Jeff's timer for three minutes, the timer on the left still shows about a minute, and the one on the right shows about 2.5 minutes. The one on the left should already have run out, and the one on the right should have a lot less time left. When the timers are shown again a couple of minutes later, Jeff's timer shows about 30 seconds having elapsed, but the others haven't changed. About three minutes later, all three are still the same. When Zara's timer goes off, it still has a minute left. Later, after Lily's timer shows zero, it still takes several minutes for the alarm to sound.