I was going to leave it the normal amount of time. But when it started bubbling about three hours after I pitched the dehydrated yeast I thought it might be going faster.
Now that I think about it though the log phase of yeast growth is so vigorous that, as Atticus says, the volume of wort doesn't really matter. I guess the only difference in adding more yeast at the start is shortening the lag phase which is why I saw bubbles faster this time around.