Disaster strikes and activity F takes $20$ days instead of the anticipated $5$ days. Using the table, how much longer will the project last than initially estimated?

Activity Predecessor Time $($days$)$

A $--8$

B $--6$

C $--3$

D A$,$B $10$

E C $8$

F A $5$

G D$,$E $3$

H G $4$

Question $10$ options:

$0$ days

$7$ days

$3$ days

$15$ days