I believe people refer to these dreams are "recurring dreams", I don't know what causes them, maybe they have a meaning to you?
You can use them to your advantage, for example let's say you have the same dream every week, you could train yourself to do a RC next time you experience that same dream again, and become lucid 
Nobody can tell how long they're dreams are exactly, of course unless they are at a sleep lab with the necessary instruments. Dream time is usually same as real-life time, but sometimes we have those dreams that last "days" (inside the dream, of course)
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