But, I've never needed to write: "Meanwhile, back at the castle...."
In fact, I can't. I don't have a narrator. Perhaps I was stupid to decide against one, but as it happens, I like walking around almost in the characters shoes without some omniscient voice spoiling my tension for me. So... how do I manage it?
Easy. I don't focus on the time aspect. Things are happening here. Other things are happening somewhere else. Even though the timing is important to the story making sense, it's not as important as the fact that things are happening. So I focus on the what more than on the when.
In my mind, I also jump between story lines on a roughly day by day basis. So if nothing's happening to Callan on day ten, I'll hop over to James. Odds are that he has something going on.Whether the reader will read this, though, I have no idea.
So how do you manage time and timing in your WiP?