If i only level the last 3 as you said, i need to wait 40 seconds for one level up (right now).
500 levels to go means 500x40=20.000 seconds = 5,5 hours if i level up immediateley when it is possible^^
Now compare to the 16 hours i lost :P
I know, its a clicker, i can just wait and get there again, but still i am kinda pissed that one day is wasted.
Having some other things to do than jsut 5 hours on clicking