Until the batteries run out or you drop the thing. At that point Ivan will saunter over and just shoot you in the face with his AK.
I'm a big fan of the AK myself, it's probably the most reliable and rugged weapon in the world, it works full of sand and mud, you can smash it over things and it won't break, jamming is very infrequent and a monkey could field-strip it. Now compare that to the OICW which requires at least four degrees and a battery the size of a small Carribean island to work (and probably weighs a bloody ton too), and wonder why I'm stroking an AK47 with a crazy grin on my face ;D