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It's common practice in Naija to freeze a corpse in the mortuary, and prepare for a befitting burial ceremony. Mind you, burial in Naija is yet another opportunity to host a party, even if it makes little sense that the chief celebrant is long dead.
As a rule, I think a Muslim must be buried within a couple of days.
Recently, some communities and Christian denominations has put in place rules mandating burials within a couple of weeks to a month, to discourage the skyrocketting cost of showcasing the dead in Naija.