It doesn't take long to learn to interchange. If you start today you won't be doing it tommorow, but if you keep it up in a few months you will. At least for t

It doesn't take long to learn to interchange. If you start today you won't be doing it tommorow, but if you keep it up in a few months you will. At least for the common times - you might have to think about what 10pm is if you normally go to bed before then.