It definitely depends on the person in terms of how long it takes and how you feel.
Some people have lots of energy, but others have reported never getting that energy rush. Some days are good some are not so good. If ketosis helps to make you feel less hungry, which it should, that's great. Try not to focus too much on it though, as you're doing so well and a large part of the diet is the minimal cals as well as the ketosis.
So don't worry if you don't feel like you have bags of energy!