Personal opinion is that's not a sudden rise or drop, far from it. 10 hour on a slow increase.
Rays, fish in general, caught in natural ponds such as oxbow lakes etc in the South American dry season have to endure big swings in temp as they are in 'small' bodies of water. But those temp swings are gradual, even if the start point and end point temps are far from one another.
What I meant by a sudden drop or increase, usually a drop I'd say, is caused during a water change. Many people top up after draining water out, with the garden hose and it doesn't take long at all for the aquarium to lose several degrees. A friend of mine did this once and forgot to turn the hose off for some reason (tank had an overflow) but he almost lost several prized clown loach of considerable size.