As Skinny Cheeks demonstrates in his video below, the visual animation length or rather how long it LOOKS it lasts for (1.47 to 1.57 seconds) is actually longer than how long the damage of the Jabs or Sweeps goes for.

So if visually the animation of Jabs and Sweeps lasts for ~1.5 seconds the actual duration (as of Stonethorn) is going to be close to 1 second. You can obviously take advantage of this in your rotations as a Stamina or Magicka Templar as you light weave.