For below questions, suppose we have these project tasks,

A$,$ estimated time $5$ days

B$,$ estimated time $2$ days, depends on A$,$C

C$,$ estimated time $7$ days

D$,$ estimated time $4$ days, depends on B

E$,$ estimated time $3$ days, depends on D

G$,$ estimated time $2$ days, depends on B

H$,$ estimated time $4$ days, depends on G

I, estimated time $2$ days, depends on H

F$,$ estiamted time $4$ days, depends on E$,$ I

J$,$ estimated time $5$ days, depends on F

What's the critical path? How long is it$?$

The development of task C goes quicker than expected, and is complete within $2$ days. What's the new critical path and its length?

Task D took $8$ days to complete instead of estimated $4.$ What's the new critical path and its length?