How quick can we change our bodies

Yesterday I was faced with this question. 

How would you like to feel right now about your body?, and I though... right now ? or when I change it ? 

Well we know everything is perception. What is real? right ?

Real is something that we can see, touch, smell, feel with our senses. 

But our senses get this information via waves and energy. So if we change that energy the perception changes. 

So how long does it take to change our body depends on how long will it take to change our  energy. 

how long does it take to change the signal we are sending? 

That depend on our beliefs. 

I believe that we can change as quickly.. as it takes to imagine the new and anchor it.