You can set the difficulty to something lower which will increase the time you have for a level so much that you basically have no time pressure anymore. But speed is a big factor of Beeftacular which is why every level has a time limit.
In the level editor you can also specify a custom time limit that can be as high as 5 minutes or longer. But why would you need so much time. You can always quickly restart the level, and since the levels are rather small and not randomized you can try as often as you please