If I practice forgiveness a lot, will I become faster at reaching an endpoint of forgiving, or will this depend on the severity of the injustice against me?
In my own experience with others, I see that as people practice forgiveness, they actually do become what I call “expert forgivers” in that they forgive more quickly and more deeply than was the case in the past. At the same time, if the current injustice is severe, this will take longer to forgive the one who perpetrated this severe injustice. Even if it takes you longer now to forgive people for recent severe injustices against you, the length of your forgiving still likely will be shorter than it might have been years ago, when you were just starting to learn about forgiveness.
For additional information, see The Forgiving Life.