cron_killer.py

from time import localtime, mktime

MAX_RUN_MINUTES = 120

def cron_killer():
    
    def __run_minutes(proc):
        t_start = localtime(proc.create_time())
        t_now = localtime()
        return (mktime(t_now) - mktime(t_start)) / 60.
  
    for proc in __get_cron_processes():
        if __run_minutes(proc) > MAX_RUN_MINUTES:
            if proc.status() in ['sleeping', 'zombie']: # you may want to kill long running processes too
                for sub_proc in proc.children(recursive=True):
                    sub_proc.kill()
                proc.kill()
        else:
            None # keep running