Refer to the exhibit.

Based on the provided exhibit, we can determine how long the UEBA agent has been operationally down by looking at the "First Occurred" and "Last Occurred" timestamps.

● First Occurred: Sep 13, 2021, at 01:10 PM

● Last Occurred: Sep 14, 2021, at 09:10 AM

From Sep 13, 01:10 PM to Sep 14, 01:10 AM → 12 hours

From Sep 14, 01:10 AM to Sep 14, 09:10 AM → 8 hours

Total downtime = 12 + 8 = 20 hours