A construction project involves the following tasks with their respective durations $($in days$)$ and dependencies:

Task A: $4$ days $($no dependencies$)$

Task B: $6$ days $($depends on Task A$)$

Task C: $5$ days $($depends on Task A$)$

Task D: $3$ days $($depends on Task B$)$

Task E: $2$ days $($depends on Task C$)$

Task F: $4$ days $($depends on Tasks D and E$)$

What is the critical path and the total project duration?