\begin{table}%t2
\caption{\label{tab:cputime}CPU time for the simulation runs.}   
%\centering
\small
\begin{tabular}{l|r}         
\hline \hline    
   Method & CPU time \\     
\hline 
   static  &  $1172$ h $36$ min \\       
   OD &  $54$   h $20$ min \\
   CT & $225$ h $18$ min \\
   RCEN & $290$ h $57$ min \\
   \hline                                    
\end{tabular}
\end{table}