There are 2 solutions. The longest is EONS with 4 letters, and the shortest is EON with 3 letters.
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No, "ONE BILLION YEARS, GEOLOGICALLY" hasn´t seen a spike right now. Solvers are most interested in: Range, Letters before a phone no., perhaps, South African plant, Pugilists' org. and Custom.
Solutions are between 3 and 4 letters long.