The Current month's checklist plus the three previous months (i.e., at least 90 days).
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The question should be How Long is a light year (in standard form) as a light year is the DISTANCE that light will travel in one year No...I'm not sure what a light year would be in a leap year.
1 seconds = 1x10^-3
1 picosecond = 1*10-12 seconds (a trillionth)
A standard sofa is about 7.5 or 8 feet long.
The noun form of the verb to long is the gerund, longing.