Sometimes in our boredom with what we are presently doing, though it is paying the bills, we look to new ventures. This is fine, but do not be quick to leave what is paying your bills for this new opportunity. I like the 40-15 rule. Keep your full-time job until your new venture, which is only taking 15 or so hours generates half of your current income. This formula allows you to maximize the time you are spending with this new venture and also establishes a benchmark for a possible transition.