We apply quantum description of time, based on Page and Wootters' mechanism, for near horizon region of black hole. It is indicated that this method of quantization of time which is a modified form of PaW approach and has been proposed in [21] can not be applied in this particular quantum region of black hole, fully. The time evolving of the system and flow of time, measurement problem, recording the history of near-horizon zone and also a consistent definition of the arrow of time are controversial in PaW approach in this particular region even by considering the previous modifications which exist in this literature. The clock ambiguity also is investigated and a unique definition of clock is defined in near horizon region of black hole.
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