Is there a limit to how long radio wavelengths can be?

[Lost in Space]

Does anyone know what the smallest and longest wavelengths of light are? As far as I am aware radio and gamma waves are the longest and shortest types respectively. But is there a limit to how long a radio wavelength could be?

 

[Quinzio]

Longest wave ?
Take a magnet in your hand and move it back and forth as slow as you can... !