How long is too long to be engaged? Should he or she be worried after a certain point?

How long is too long to be engaged? Should he or she be worried after a certain point?
1 to 3 months is too long.
4 to 6 months is too long.
8 to 12 months is too long.
14 to 18 months is too long.
2 years is too long.
3 years too long.
Other number
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How long is too long to be engaged? Should he or she be worried after a certain point?
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