Buddha Abhidhamma - Ultimate Science - BuddhaNet

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So the life-time of a citta is equal to the three short instants
of arising, existing and dissolving of the citta or it is equal to
one conscious-moment or one cittakkhaõa. One cittakkhaõa is
better represented by ‘one conscious-moment’ rather than ‘a
thought-moment’ which is coined by some translators.
The duration of one cittakkhaõa (i.e., one conscious-moment)
will be hard to be verified by science. But we ourselves know
from experience that it is possible within one single second to
dream of innumerable things and events.
The life-span of Råpa
The life-span of råpa or corporeality is 17 times longer than that
of citta. So we can say that the life-span of råpa is equal to 17
cittakkhaõas or 17 conscious-moments or 17 x 3 = 51 short instants
as there are 3 short instants in a moment of consciousness.
Thus råpa also arises and dissolves at a tremendous rate of
more than 58 billion times per second. The difference between
citta and råpa is that citta arises one after another whereas råpa
arises by thousands of units at a small instant and it goes on
arising incessantly at every small instant. Therefore råpa may
be piled up to large masses which are visible to the naked eye
whereas the fleeting stream of consciousness is invisible to the
naked eye.
Six Types of Vi¤¤àõa
Vi¤¤àõa cittas (consciousness) may be classified as follows
according to the six sense-doors and the six physical-bases
(vatthu):
1 Cakkhu-vi¤¤àõa – 2 eye-consciousness
2 Sota-vi¤¤àõa– 2 ear-consciousness