it's for one year, 0.000000008*60*60*24*365=0.252288
Could you provide your calculations on how the PACMiC V3 can achieve a 25% APR? Does that assume the auto rebuy feature is turned on all year long or some portion of the year?
But, your not earning .000000008 btc per second all year long, in fact, with the new cost being .666 btc, you don't even earn .8 satoshis per second on the first block found.
Also, it is impossible to earn .8 satoshis for an entire year (given no difficulty or price changes) because your taking it times the remaining balance, which, no matter if the auto rebuy is on or off, will not be exact same again. It's quite a misleading calculation. Still really good returns (My math shows more around 12.7% with no auto rebuy), but the math used to get to the 25% is pretty misleading.