diff --git a/generators/gameOfLife.py b/generators/gameOfLife.py
index 053734d..1b01e60 100755
--- a/generators/gameOfLife.py
+++ b/generators/gameOfLife.py
@@ -4,6 +4,7 @@ from blup import frame
 from blup import animation
 import blup.writebml
 import argparse
+import math
 
 r.seed()
 
@@ -42,9 +43,12 @@ if __name__ == "__main__":
     argument_parser = argparse.ArgumentParser(description="Game of Life bml generator")
     argument_parser.add_argument('-o', dest="output_path", type=str, help="output file (mandatory)")
     argument_parser.add_argument('-w', dest="world", type=list, default=None, help="pre-constructed world (optional)")
+    argument_parser.add_argument('-t', dest="secs", type=int, default=90, help="time in seconds (optional)")
     argument_parser.add_argument('-d', dest="delay", type=int, default=300, help="delay between frames (optional)")
     args = argument_parser.parse_args()
 
+    frames = math.floor(args.secs * 1000 / 300)
+
     dimension = frame.FrameDimension(WIDTH, HEIGHT, COLOR_DEPTH, COLORS)
     game_of_life_animation = animation.Animation(dimension)
 
@@ -66,7 +70,7 @@ if __name__ == "__main__":
                 print("len(rows) != "+str(WIDTH)+". counted "+str(len(i)))
                 exit()
 
-    for frame in range(500):
+    for frame in range(frames):
         # construct frame
         new_frame = animation.AnimationFrame(dimension, args.delay)
         for row_index in range(HEIGHT):