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As reported in a number of recent studies, turbulence in pipe flow is transient for Re!2000 and the flow eventually always returns to the laminar state. Generally, the lifetime of turbulence has been observed to increase rapidly with Reynolds number but there is currently no accord on the exact scaling behaviour. In particular, it is not clear whether a critical point exists where turbulence becomes sustained or if it remains transient. We here aim to clarify if these conflicting results maydoi:10.1098/rsta.2008.0199 pmid:18990664 fatcat:czhidslgajbklegrsxlrufaysq