Potential answers for "Mind-boggling time span"

⭐⭐⭐⭐ EON
⭐⭐⭐ EONS
⭐⭐⭐ HARD
⭐⭐⭐ NOTTOBEBELIEVED
⭐⭐⭐ ENIGMA
⭐⭐⭐ OPART
⭐⭐ ERA
⭐⭐ DYLAN

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