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Actually, they can often do it in one shot, depending on how the shot is set up... for instance, if there is some obstacle blocking the view for even a second (say, a column or curtain passing between the actor and a tracking camera), an actor can literally take a step to the side, and the double steps right in. In shower scenes, steam and shower curtains, and even mirrors, can accomplish the same thing.
I used to laugh it up in action scenes, where a man would go diving into a room through a window, say, land behind a sofa... and the actor pops up to continue the scene. The actual stunt double is still behind the sofa, and the actor was waiting for him to land there before coming up. In-camera (or one-shot) gags are always easiest, but when you know what to look for, it can be painfully (and laughably) obvious sometimes!
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