automate clicking over an area for a certain amount of time with python

click_area.py

import autopy
import time
from subprocess import call

start_location = [1540, 1004]

stop_location = [1790, 1121]

step = [20, 5]
delay = 0.001
duration = 15*60

start_time = time.time()

abort = False

while ( not abort ):
  current_location = start_location

  for x in range(start_location[0], stop_location[0], step[0] ):
    for y in range(start_location[1], stop_location[1], step[1] ):

      autopy.mouse.move( x, y )
      autopy.mouse.click()
      time.sleep(delay)

      pos = autopy.mouse.get_pos()

      if (time.time() - start_time) > duration :
        abort = True
      elif pos[0] < start_location[0] :
        abort = True

call("osascript -e \"set Volume 7\"", shell=True)
call(["say", "Hey! Nick, you should check on your computer" ])