Isn't it 10x that?
Sanity check: say 10^5 seconds/day. Then it would be
400 * 10^9 / 10^5 = 4 * 10^6
https://www.google.com/search?q=400+*+10%5E9+%2F+%2824+*+60+...
Sanity check: say 10^5 seconds/day. Then it would be
400 * 10^9 / 10^5 = 4 * 10^6
https://www.google.com/search?q=400+*+10%5E9+%2F+%2824+*+60+...