\begin{gantt}{5}{8}
    \begin{ganttitle}
        \numtitle{5}{5}{40}{1}
    \end{ganttitle}

    \ganttbar{Base}{0}{2}
    \ganttbar{Fenêtrage}{2}{2}
    \ganttbar{Hashlife}{4}{4}
    \ganttbar{Rapport}{0}{8}
\end{gantt}