This is how long I usually have to wait for a Metro train: (Bay Area transit nerds, eat your heart out.)
The next train will arrive in 2 minutes. The following train will arrive in 4 minutes.
Now it’s not always this awesome. Sometimes I need to wait 4 minutes for the next train. And at night, I’ve waited as long as 7 minutes. On some lines, I hear people need to wait
19 minutes for the next BART train 9 minutes.