Where to place [self.navigationController showSGProgressWithDuration:ellapsedSeconds]; in a UIWebView

[S1U]

Thank you for your sample! I'm leveraging it in my app, but have some questions.

1. which methods to place [self.navigationController showSGProgressWithDuration:ellapsedSeconds]; - (void)webViewDidFinishLoad:(UIWebView *)webView or - (void)webViewDidStartLoad:(UIWebView *)webView ?
2. How about ellapsedSeconds, where to place?

NSDate * endDate    = [NSDate date];
ellapsedSeconds     = [endDate timeIntervalSinceDate:startDate];

Thank you!