I guess it depends. Elrond is around 7.000 years old when having this conversation with Gandalf, so 1.000 years might be like 10 years to a 70-year old. Arwen is less than 3.000 years old, so maybe 1.000 years to her is more like 10 years to someone in their late 20s (and as someone in their early 30s, that's a damn long time)? To Galadriel or Cirdan on the other hand 1.000 years might just be like ”Damn, I slept in again, what age is it?“