“Many years” in Japanese
Short answer
Many years in Japanese is “永年” (einen). Full meaning: many years, a long time.
Other ways to say “Many years” in Japanese
年来
nenrai many years, long time; for ... years, since ... years ago
長年
channen many years, a long time
多年
tanen many years
何年間も
nannenkanmo many years
千秋
chiaki thousand years, many years
なが年
naganen many years, a long time
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