Answer:
The full cycle of Moon phases takes on average 29 nine days and 12 hours for 8 phases when i name the “minimal moon” as a distinct phase (it vary a bit over and under that because Earths orbit is elliptical).
That gives us 2 half cycles of 4 phases each:
Minimal Moon. The moon show hardly any crescent and the bit of crescent it do show is nearly horizontal. Earth, Moon and Sun is near conjunction (on the same line, there may be a solar eclipse in mid phase).
New Moon (aka Waxing Crescent). The crescent grows and becomes more vertical.
Half moon (aka First Quarter) . The crescent is now halfway to full moon.
Waxing Gibbous. We see the moon as convex on both sides, and growing.
Full moon. We see the moon as circular ( again near a conjunction, there may be a lunar eclipse in mid phase)
Waning Gibbous. We see the Moon shrinking again.
Third quarter (the ‘other’ half moon, but now it is the other half of the Moon we can see).
Waning Crescent (shrinking crescent)
‘Waxing’ means growing and ‘Waning’ means shrinking. ‘Gibbous’ means fat, and now the cycle start over with:
Minimal Moon. again
Each phase takes 29.5/8 days. that is 3 days and 16.5 hours
So to answer your question: New Moon to Full Moon is 3 phases. 9 days + 49.5 hours = 11 days and 1.5 hours
The naming of the moon phases is based on human eyesight estimates. That is why I felt a need to introduce the ‘Minimal Moon’ phase to make it Mathematically consistent.
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