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When an RFID tag is in a read field, it is read constantly. A reader might communicate with a tag on a box situated on a shelf hundreds of times per minute. Typically, a reader is set up to pass information to back-end systems when something changes, such as a new tag being introduced into the field, indicating another item has been put on the shelf, or a tag no longer being in the field, indicating the box was removed from the shelf.
So, yes, it is possible to use an RFID system to determine how long a car was parked or how long a product sat on a shelf. Software on the reader would provide information regarding the first time a tag was read, including the date and time of the tag read, as well as the last time it was interrogated. You could then calculate how long the car remained in the parking space.
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