What is the critical path for the project?

D Activity Duration Predecessor$($s$)$

$1$ Baseball Stadium

$2$ Clear stadium site $60$ days $$

$3$ Demolish building $30$ days $2$

$4$ Set up construction site $30$ days $2$

$5$ Drive support piling $120$ days $2$

$6$ Pour lower concrete bowl $120$ days $5$

$7$ Pour main concourse $120$ days $4,6$

$8$ Install playing field $90$ days $4,6$

$9$ Construct upper steel bowl $120$ days $4,6$

$10$ Install seats $140$ days $7,9$

$11$ Build luxury boxes $90$ days $7,9$

$12$ Install jumbotron $30$ days $7,9$

$13$ Stadium infrastructure $120$ days $7,9$

$14$ Construct steel canopy $75$ days $10$

$15$ Light installation $30$ days $14$

$16$ Build roof supports $90$ days $6$

$17$ Construct roof $180$ days $16$

$18$ Install roof tracks $90$ days $16$

$19$ Install roof $90$ days $17,18$

$20$ Inspection $20$ days $8,11,13,15,19$