amberale,
you're right, 1:58 when you should have 2:00 is pretty unlikely to cause a problem.....
However.....if the following aircraft were, heaven forbid, to crash, and lawyers acting for whoever were to determine from SMR replays etc that you had failed to provide the required minimum, even by a few seconds.....
I know the fatal on approach to Mexico City a few months back was more extreme than just a couple of seconds, but it's a sobering reminder of the dangers of vortex.