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question about ipv6 interface id

Could anybody tell me why we need a 64bit fixed length interface id? and do we really need a network that contains so many hosts?
If router advertise a prefix which is longer than 64bit,then the possibility of address duplication is increasing.for example ,it will overwrite 56 bits of the 64bit interface id when router advertise a 120bit length prefix.so only 8 bits is left for interface id.how can we deal with this?
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