 to <code>FFTW_EXHAUSTIVE</code> mode.
</p>
<p>Note that the <code>seconds</code> argument specifies only a rough limit; in
practice, the planner may use somewhat more time if the time limit is
reached when the planner is in the middle of an operation that cannot
be interrupted.  At the very least, the planner will complete planning
in <code>FFTW_ESTIMATE</code> mode (which is thus equivalent to a time limit
of 0).
</p>

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