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\item \textbf{SKA1-SYS\_REQ-2962:} \textit{\bf SKA1\_Low Pulsar Timing resolution.} The SKA1\_Low Pulsar timing mode shall have a timing resolution of better than 100 ns.  \end{itemize}  We will approach this in three two  ways: Initially Firstly  we will look at the maximum timing resolution that can be envisaged as being required for pulsar timing with SKA1 in the absence of interstellar scattering. Taking this derived limit, and secondly,  we willthen  consider how this limit evolves with dispersion measure when we take into account interstellar scattering. Finally we will consider the computational complexity of the problem at hand and will discuss the implications of our findings multi-path scattering imposes further limits  onthe design and cost of the pulsar  timing hardware from SKA1\_Low and SKA1\_Mid. resolution as a function of dispersion measure.