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\subsection{Possible timescale and physics programme}  The design study is expected to deliver its conclusion in 2018, in time for the next update of the European Strategy. Should the case be still as strong as today, a go-ahead decision could be taken immediately and the tunnel excavation could start at the beginning of the next decade, for a duration of four to eight years, with the simultaneous operation of up to three drilling machines~\cite{cite:Osborne}. machines~\cite{OsbornePrivate}.  The construction and installation of the collider and the detectors would then proceed in parallel with the HL-LHC running for another four to five years. It could thus be technically envisioned, setting aside political, financial, etc., considerations, to start commissioning for the first TLEP physics run as early as in 2030. It will take between a couple months (as at LEP2) and a couple years (as at LEP1) to achieve the design luminosity. Typically, the baseline physics programme of TLEP would consist of   \begin{itemize}