Mm. Given your current appearance, if you're full blooded, I would guess that would put you around two to three millenia as a baseline. Unless you died or reincarnated fairly young in your other lives, I think it's safe to say we can triple that as a bare minimum, were you a fullblood.

That said, I remember you deliberately saying your current physical age is far less when you spoke to one of our own. Older than I expected at first glance, but not by an incredible amount.

So I'd guess you're a half blood still very early in your current cycle. If you have always been a half-blood, and have just lived a natural life, it sounds by my guesses that you still live at least double the rate of your current appearance.

So a minimum of 600, upwards of a maxiumum of 6000, would be my first guess for your total lifespan with no further information.