Umm July 2009 so uh 4032/2595*100 is 35.6% of my life having owned blockland. That's about 2500 hours played too.
That's over 104 days just playing blockland. Out of the 2595 days I've owned it that's like4% off all my time on BL. In my whole life that makes just over 1%.
My conclusion is that I forgot how to calculate percentage because there's no way I've spent 1.5% of my whole life playing Blockland.