A project has been defined to contain the following activities, along with their time estimates for their completion.

What is the project duration?

$\backslash$table$[[$ACTIVITY$,\backslash$table$[[$IMMEDIATE$],[$PREDECESSOR$]],\backslash$table$[[$OPTIMISTIC$],[$DURATION$]],\backslash$table$[[$MOST LIKELY$],[$DURATION$]],\backslash$table$[[$PESSIMISTIC$],[$DURATION$]]],[$A$,-,1,4,7],[$B$,$A$,2,6,7],[$C$,$D$,3,4,6],[$D$,$A$,6,12,14],[$E$,$D$,3,6,12],[$F$,$B$,$C$,6,8,16],[$G$,$E$,$F$,1,5,6]]$

$26\mathrm{.}33$

$23$

$30\mathrm{.}66$

$33$

$35$