Pluto's orbital period is 248 earth-years. That means from the time it was discovered (in 1930) until now, it hasn't accomplished even one revolution around the sun.
Two relevant thoughts from the Reddit thread:
"...assuming they have the same life span as humans, Plutonians would never celebrate their Plutonian birthday!"Image via Thinking Sci-Fi.
"I wonder when Plutonians celebrate their New Year, and how much more awesome the parties must be if you have to wait that long."
I believe that Neptune just recently completed it's first full orbit since discovery.
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