The max poisoned time is: last attack + duration - first attack

Possible Ashe's clear states: timeSeries[i] - timeSeries[i-1] - duration

O(n) solution in Java:

```
public int findPoisonedDuration(int[] timeSeries, int duration) {
if (duration==0 || timeSeries.length==0) return 0;
int n = timeSeries.length;
int total = timeSeries[n-1]+duration-timeSeries[0];
for (int i=1; i<n; ++i) {
int d = timeSeries[i] - timeSeries[i-1];
if (d>duration)
total -= (d-duration);
}
return total;
}
```