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> Nigeria is likely to have a billion people in a few years.

There are less than 220M people in Nigeria now. The population growth is very fast, but even on long odds it's more accurate to say "a few decades."

I think what I read predicted a billion in Nigeria by century end, 10B total. But a lot can happen in 80 years.

The century will end in about 77.15 years, at which point most of us reading this will be dead.

A bit more than 'a few'.

There have been anatomically modern humans for ~300,000 years. We have had systematic agriculture for just a while.