documentclass{article}
 usepackage{tikz}

 begin{document}

 begin{tikzpicture}
 % draw horizontal line

   draw (0,0) -- (12,0);

   % draw vertical line
   foreach x in {0,2,9,12}
   draw (x cm,3pt) -- (x cm,-3pt);

   % draw nodes
   draw (0,0) node[below=3pt] {00' } node[above=3pt] {Starts};
   % draw (0,0) node[below=3pt] {00' } node[above=3pt] {Lesson\starts};  % <- !
   draw (2,0) node[below=3pt] {10'} node[above=3pt] {Pre-text};
   draw (9,0) node[below=3pt] {45'} node[above=3pt] {Text};
   draw (12,0) node[below=3pt] {60'} node[above=3pt] {Ends};

 end{tikzpicture}

 end{document}