Question

Is earth began to spin a little bit faster

Answer 1

I would say all of them but if I had to choose one I would say the days would get shorter because if earth began to spin faster then the sun would only be out for a couple of hrs and we would mostly see night than day

Answer 2

If Earth began to spin faster, then the days would be shorter. That is ... less than 24 hours. Depending on how fast the spin is, the days would be 22 hours or 20 hours or 16 hours Etc. Whatever the total time became, half of it would be daylight and the other half would be Darkness.