how many ticks of simulation (at normal speed) in netlogo is equal to the real world 1 second?
From my experience with NetLogo, I don't think the ticks DO map to real world time. I believe they are unitless. Did you read something to the contrary?
Ticks are a unit of arbitrary time measurement inside the simulator, like most simulation engines ticks don't map directly to real world time - it's up to the person writing the simulation to decide how a tick maps to real world time.
As for the "normal speed" setting that NetLogo has, what that means is (and this is from experience, not from knowledge of how the engine actually works) that each time a tick is processed NetLogo will wait until the graphical display is updated before starting on the next run.
If you slow down the simulation (move that slider to the left) then NetLogo waits additional time before each simulation step, if you speed it up (move the slider to the right) then NetLogo will continue simulating while the graphical display updates, meaning you probably won't see every simulation step visualised.