The following represents a project with known activity times. All times are in weeks.

Activity

Immediate

Predecessor

Time

A

$-$

$4$

B

$-$

$3$

C

A

$2$

D

B

$7$

E

C$,$ D

$4$

F

B

$5$

Using the data in Table above, what is the minimum possible time required for completing the project?