$\backslash$table$[[$Activity$,$LS$,$LF$],[$H$,15,22],[$G$,12,22],[$F$,9,15],[$E$,8,12],[$D$,14,15],[$C$,10,12],[$B$,0,8],[$A$,3,10]]$

The slack times are:

$\backslash$table$[[$Activity$,$Slack$],[$A$,3],[$B$,0],[$C$,3],[$D$,7],[$E$,0],[$F$,1],[$G$,0],[$H$,1]]$

The activities on the critical path are

The total project completion time for Dave $=$ weeks.