gistfile1.txt

define Timer {
    tag : '',
    date: undefined, 
    constructor : function(tag, date){
        this.tag = tag;
        this.date = date;
    }
}

rule rulename {
    when {
            // for first firing          // all following
        t : !(Timer t.tag=='rulename') || (t.tag=='rulename' && t.date > 5 minutes)
        // other conditions
    }
    then {
      // do sth. 
      // update timer
    }
}