Effect of time on emotion self-perception When I participated in the study that led to "A Wandering Mind Is an Unhappy Mind" I answered questions on my phone that insisted that I answer as soon as I got the notification. This made me assume that there is a significant change in emotional perception as time passes, however I can't find any evidence of this. In other words, how is the experience of an emotion affected by the amount of time between it's experience and it's recollection? If this question is too broad, it can be narrowed down to pain and pleasure.
As shown in the Wikipedia section "Memory of felt emotion" there are many ways that recollected emotion is significantly different than experienced emotion. From the section:


  Another study found that people's memories for how distressed they
  felt when they learned of the 9/11 terrorist attacks changed over time
  and moreover, were predicted by their current appraisals of the impact
  of the attacks (Levine et al., 2004). It appears that memories of past
  emotional responses are not always accurate, and can even be partially
  reconstructed based on their current appraisal of events. [45]
  
  Studies have shown that as episodic memory becomes less accessible
  over time, the reliance on semantic memory to remember past emotions
  increases. In one study Levine (2009)[47] primes of the cultural belief
  of women being more emotional than men had a greater effect on
  responses for older memories compared to new memories. The long term
  recall of emotions was more in line with the primed opinions, showing
  that long term recall of emotions was heavily influenced by current
  opinions.
  
  [45] Levine L.J. and Pizarro D.A. (2004) "Emotion and memory research:
  A grumpy overview" Social Cognition, Vol. 22, No. 5, 2004, pp.530-554
  
  [47] Levine; Lench, Heather; Safer, Martin (2009). "Functions of
  Remembering and Misremembering Emotion". Applied Cognitive Psychology.
  23: 1059–1075.