I am currently learning the skill Better Learning 5 which is going to take a grand total of 4+ days to learn. As part of the quest that directs the player to get 997+ favor and use it to learn a skill for its patron giant faster I got up to 1003 favor and used it to learn Better Learning 5 faster. This did complete the quest. The text stated that it would speed up the skill learning by 2+ days. When I clicked on the button to use the favor the magic rock sped up the reading animation as expected, but, the skill is still be ticking down at the normal every second rate and the time to skill completion did not update to reflect suddenly being 2+ days shorter.