The pillars of Hajj are: the intention for Ihram, standing in Arafah, Tawaf and Sa’ai. If any of these were missed, the whole hajj is invlaid and a sacrifice would not make up for it.

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No, this is not right. You only make Talbiyah if you are in the state of Ihram.

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There is no limit the only thing is that it should be even number and you conclude it with witr so that total would be odd number

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