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\subsection{Possible Timescale}  The timescale is directly related to the Physics case, or better said, to the scientific interest of a collider. The TLEP design study is expected to deliver its conclusion in 2018, just prior the next update of the European Strategy. Should the case be still as strong as today, a go-ahead decision could be taken and the tunnel digging could start at the beginning of the next decade, for a duration of four to five years, with the simultaneous operation of three drilling machines. The construction and installation of the collider and the detectors would then proceed in parallel with the HL-LHC run for another four to five years. It could thus be technically envisioned to start the first TLEP Physics run as early as in 2030.  This starting date is similar to that estimated for the ILC (2028-2030), should a decision be taken soon. The Physics physics  programme of TLEP would consist of two years at the Z pole, one year at the WW threshold, five years at 240 GeV as a Higgs factory, and five years at the $\ttbar$ threshold. The effective duration of the running at each energy as well as the appropriate order will be defined according to the physics needs as more knowledge is acquired. The VHE-LHC would be installed from the mid forties onwards, and Physics the physics programme  could start in 2050 or thereabout.