Add Reel video duration to Instagram analytic

Zernio already provides the average and total watch time for Instagram Reels, but it does not include the Reel’s duration.

Without the video duration, applications cannot calculate an estimated retention percentage. This forces developers to either leave retention unavailable or rely on unreliable workarounds such as temporary media URLs.

It would be very useful if Instagram Reel analytics included a video duration field whenever Meta provides it. This would allow creator dashboards to calculate retention accurately and honestly without requiring a separate Meta integration.