Hey there. I'm a fourth year medical student and probably not fully qualified to answer this question, but I'll do my best.
First off, following a heart attack, usually the heart continues to beat, although it may beat less effectively, or develop an arythmia. If the heart actually stops beating, this is called asystole. Asystole is rare, and once a person has entered asystole, it is very hard to restart their heart. It is generally a confirmation of death, rather than a condition that is considered treatable. Defibrillating an asystolic heart is unlikely to be helpful.
So to answer your question, no, if a heart has stopped beating for thirty minutes, it usually cannot be restarted. In fact, the timeframe for restarting a heart that has stopped beating is only around 90 seconds to 5 minutes, and even within this time, restarting an asystolic heart is rarely successful.
The exception to this is if the person whose heart has stopped is given really good CPR from the moment that their heart stops beating, in order to maintain blood supply to the heart. This can extend the timeframe in which an unbeating heart is restarted.
In addition, if the unbeating heart is chilled to a near freezing temperatures (ie, removed from the chest), this can slow down the death of cardiac tissue and again prolong the survival of cardiac tissue so that it can still be restarted after 30 minutes.
As of October 2009, the record for the GameCube version is one hour and thirty-eight minutes, by Alastair 'DJGrenola' Campbell.
Seven minutes, thirty seconds to twenty-two minutes, twenty-nine seconds rounds to :15 Twenty-two minutes, thirty seconds to thirty-seven minutes, twenty-nine seconds rounds to :30 Thirty-seven minutes, thirty seconds to fifty-two minutes, twenty-nine seconds rounds to :45 Fifty-two minutes, thirty seconds to seven minutes, twenty-nine seconds rounds to the hour.
Seven minutes, thirty seconds to twenty-two minutes, twenty-nine seconds rounds to :15 Twenty-two minutes, thirty seconds to thirty-seven minutes, twenty-nine seconds rounds to :30 Thirty-seven minutes, thirty seconds to fifty-two minutes, twenty-nine seconds rounds to :45 Fifty-two minutes, thirty seconds to seven minutes, twenty-nine seconds rounds to the hour.
90 minutes.
Thirty Minutes over Tokyo was created on 1999-05-16.
Thirty Minutes - 1911 was released on: USA: 12 April 1911
No. It is three thirty, but in five minutes time it will be three thirty-five.
AT NIGHT!30 minutes prior to sundown and thirty minutes after sunup
Thirty Minutes in Havana - 1920 was released on: USA: April 1920
Thirty Minutes or Less - 2001 was released on: USA: July 2001
90 min
60 minutes or 1 hour.