Heavy Construction
The Allen and Greenough is still under construction;
so some links may not work quite the way you would expect.
Quantity.
9.
The Quantity of a Vowel or a Syllable is the time
occupied in pronouncing it. Two degrees of Quantity are recognized, -
long and short.
a. In syllables, quantity is measured from
the beginning of the vowel or diphthong to the end of the syllable.