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			For me, I like to use time left (usually in book, but sometimes in chapter)  I know that some people say that it's not accurate, but it usually is for me.  The only time it gets confused is if I jump backwards or forwards to search for something in the book...although unless I'm very close to the end of the book when I do my search it will fix itself after a chapter or so.
		 
		
	
		
		
		
		
		
		
		
		
		
		
	
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