Twitter product boss and Square CEO Jack Dorsey tried to explain how he's maintaining his professional balance between the two companies to Kara Swisher at All Things D.

It sounds pretty unsustainable.

He says he spends 8-10 hours at Square, then 8-10 hours at Twitter, and squeezes in sleep where he can.

Either he's fibbing here, or he's due for a serious burn out.

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