Use 'durative' to emphasize that an action persists through time, not just a moment. His compassion is a durative quality, not just occasional kindness.
Pro Tip 2/3
Contrast with Instantaneous
'Durative' contrasts with actions that are brief, so use when highlighting duration. Unlike a flash of lightning, love is durative.
Pro Tip 3/3
Not Just Positive
'Durative' can describe both positive and negative long-lasting situations. The conflict has a sadly durative presence in the region.