Rasgulla is like a small ball at first but increases in size when cooked. While cooking time is not the same for everyone, this time depends on the quality of the ingredients and the size of the ball produced. That is why I cannot tell you exactly the exact time when your preparation will be ready. In your case, it may take up to 10 minutes more or less than 10 minutes. So the best way to see if it is made properly is to pick up a Rasgulla and place it in a pot filled with water. If you see that it is submerged, it means that your Rasgulla is ready, but if it is floating in the water, then you will need to cook for a while.