Use the data in this table to answer the questions that follow:

Activity

Preceding Activity

Estimate in Months

Start

$0$

D

Start

$4$

A

Start

$6$

F

D$,$ A

$7$

E

D

$8$

G

F$,$E

$5$

B

F

$5$

H

G

$7$

C

H

$8$

End

C$,$ B

$0$

What is the duration of the critical path?