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[FR] `PredictNumItersNeeded()` 1.4 correction factor

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**Problem description** In the function [`PredictNumItersNeeded()`](https://github.com/google/benchmark/blob/08fdf6eb84cc8a5b65d84041257c908de5879bf5/src/benchmark_runner.cc#L313) there is this `1.4` correction factor. This causes the time running the experiment to exceed by ~40% the time specified by `--benchmark_min_time`. Of course,...

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