Hi, I'm trying to do what the title talks about.  Currently I have 

public final class Range extends Script  {

    long start = System.currentTimeMillis();
    long end = start + 5*random(50,60)*random(60)*random(1000); // 60 seconds * 1000 ms/sec

Then in my onLoop method, I have if (System.currentTimeMillis() > end) { stop()}.  I'm trying to have the script shut down after a random amount of time between 5 and 6 hours.  It shut off after less than 1 hour though, am I converting my values incorrectly?  

random(60)*random(1000) ... you are using 2 random vars for things that are units....

this should work ... random(5*60,6*60)*60*1000;