Let's say the Moon's complete cycle of phases is about 28 days (4 weeks) ... just so the arithmetic is easier. (Close enough. It's actually 29.53 days.)
If it's halfway through the waxing crescent, then it'll reach first quarter in 3 days or so.
From there, it'll take the next 7 days to become Full, and another 7 days to reach last quarter.
Total from half-waxing-crescent to last quarter . . . about 17 days.
<u>This is what I think is harmful!
</u>
<u></u>1.) <u>Deadly gases</u> (Example: C<span>arbon Monoxide</span>)
2.) <u>Poison
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3.) <u>Snake bites</u>
(There is to many to list :D)
Have a good Day/Night :D