You made an error. 2^48 should be replaced with 2^(128-48): http://www.wolframalpha.com/input/?i=%282%5E125%29%2F%282%5E%28128-48%29+*+1000+*+60+*+60+*+24+*+365

You made an error. 2^48 should be replaced with 2^(128-48): http://www.wolframalpha.com/input/?i=%282%5E125%29%2F%282%5E%28128-48%29+*+1000+*+60+*+60+*+24+*+365%29+ http://www.wolframalpha.com/input/?i=%282%5E125%29%2F%282%5E...