code:

you wrote
Process proc=null;
try{
    proc = Runtime.getRuntime().exec("c:\\a.exe");
}catch(IOException e){}
Thread.sleep(5000 * 60);
try{
   int result = proc.exitValue();
   // пишем время
} catch(IllegalThreadStateException e) {
   proc.destroy();
   // пишем, что плохо
}

 

code:

import java.io.IOException;

public class Proc {
    public static void main(String[] args) throws InterruptedException {
        Process proc=null;
        try{
            proc = Runtime.getRuntime().exec("notepad");
        }catch(IOException e){}
        boolean badExit = true;
        long maxTime = 1000000000;// 1 секунда
        maxTime *= 300; // 5 минут
        long startTime = System.nanoTime();
        long curTime = System.nanoTime();
        while(curTime - startTime < maxTime){
            try{
                int result = proc.exitValue();
                System.err.println("Время " + (curTime - startTime) / 1000000 + " мсек");
                badExit = false;
                break;
            } catch(IllegalThreadStateException e) {}
            curTime = System.nanoTime();
        }
        if(badExit){
            proc.destroy();
            System.err.println("Все плохо");
        }
    }
}

code:
public class ProcessTest
{
    public static void main(String args[])
    {
        try {
            Timer timer = new Timer(true);
            final Thread mainThread = Thread.currentThread();
            long timeBegin = System.currentTimeMillis();
            final Process process = Runtime.getRuntime().exec("calc.exe");
            timer.schedule(new TimerTask() {
                public void run() {
                    mainThread.interrupt();
                    process.destroy();
                }
            }, 5*60*1000);
            int result = process.waitFor();
            timer.cancel();
            mainThread.interrupted();
            System.out.println("Process has exit with code " + result + " after " +
                        (System.currentTimeMillis() - timeBegin) + " milliseconds.");
        }
        catch (InterruptedException e) {
            System.out.println("Process didn't exit in 5 minutes.");
        }
        catch (Exception e) {
            System.out.println("Error.");
        }
    }
}