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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Long time span:

EONS: Long, long time spans
ERA: Long time span
EON: Long time span
EONS: Very long time spans
EONS: Long time spans
AEON: Really long time span
EON: Long span of time
AEON: Long span of time