A measurement of time found on a map

Question: I'm a measurement of time.
But you'll find me on a map, not a clock.

What am I?

Question: How do you spell mousetrap with three letters?

Question: Look at my face, I am somebody. look at my back, i am nobody. What am I?

Question: What tastes better than it smells?

Question: What goes in the water black and comes out red?

Question: What loses its head in the morning and gets it back at night?