“I think it’s public knowledge today that we’re operating with a time period for a so-called breakout of about two months. That’s been in the public domain,” Kerry testified at a Senate hearing.

Iran’s breakout time is defined as how long it would take it to produce fissile material for one weapon.

Kerry made his comment in response to a question about whether negotiators over Iran’s nuclear program were aiming for a 6- to 12-month “breakout” period, which Kerry declined to confirm as talks are continuing.