Heya RyanParis

Hope you are well 

Indeed the classroom of life and also earth is special because the things in earth are so material and solid that people come back again just to experience the matter of it.

Phew - how many earth lives could you and all of us in the year 2006 could of had?!

I say more than 4 or 5 - but if this number sits well with you then you know yourself well.
I don't have hard evidence only from extracts of literature etc but i would say in the region of 1000 lives up to our present era. 

Taking a calculation of @ two lives in a millennium
0          -    2000   four lives
-2000   -    0         four lives
-4000   -  -2000    four lives
-6000   -  -4000    four lives
-8000   -  -4000    four lives
-10000 -  -8000    four lives

Stopping at 10,000 BC approx 24 lives!
but i say our earth history goes back 1 billion years
i reckon we started reincarnating on earth, once it was ready for us, at least 2 million years ago.

This is just on the earth plane.  Time; that movement of measure! 

Open to further discussion on my time scales 

Lets face it RyanParis .. you old and wise!