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1 year=12 months
1 year=365.242 days
1 year=48 weeks

In month:
3 years(\frac{12 months}{1 year})=36 months

In weeks
3 years(\frac{48 months}{1 year})=144 months

In days
3 years(\frac{365.242 days}{1 year})=1,095.73 days

Hope this helps =)