How long does it take to charge the HyperJuice Plug?

For HyperJuice Plug (1st generation) released before May 2013
For the Plug 10,400mAh, recharge time is around 8 hours.
For the Plug 15,600mAh, recharge time is around 12 hours.

For HyperJuice Plug (2nd generation) released on and after May 2013
For the Plug 10,400mAh, recharge time is around 4 hours.
For the Plug 15,600mAh, recharge time is around 6 hours.