None, since there can be no conversion. A metre is a measure of length in 1-dimensional space while a year is a measure of time. The two measure different characteristics and, according to the most basic principles of dimensional analysis, any attempt at comparisons or conversions between the two are fundamentally flawed.
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1 light year = 9.4605284 × 1015 meters
10 meters
Umm, you need one million meters to make one million meters.
...1570 meters. A ten-year old can answer that, and I know that because I am a ten-year old.
One fermi is one femtometer, which is equal to 10-15 meters, or 0.000,000,000,000,001 meters.