Electron Drift in Copper Wire: 40m in 0.020mm/s = Days?

[MegaEriable]

The drift speed of the electrons in a copper wire running from a battery to a light bulb and back is approximately 0.020 mm/s. The battery is at the front of the classroom and wire runs out of a perimeter of the room to the light bulb. The total length of wire is 40meters. How long would it take a single electron to drift from the negative terminal of the battery and back to the positive terminal? Express your answers in days as well.

 

[Stonebridge]

Do you know the equation that relates distance travelled, time and speed?