Energy-saving fluorescent light bulbs – do they use less energy if switched on for only a minute?

I heard it kick using energy when you turn on first, and then use a lot less and they stay on. It is more than the initial amount, say normal 60W light bulb? If so, what is the length of time in which both use the same amount of energy? This is not a test question – I just wanted to know if it’s worth using energy saving light bulbs where they are often used for a short time – closets, bathrooms, etc.