Try something like this:
|makeresults | eval _raw="Time UUID event_name_status actual_important_log_time
2020-03-26T12:00:00 123456789 car_end 2020-03-25T16:50:30
2020-03-26T12:00:00 123456789 car_mid 2020-03-25T16:40:30
2020-03-26T12:00:00 123456789 car_start 2020-03-25T16:30:30
2020-03-26T12:00:00 123456788 car_end 2020-03-25T15:50:30
2020-03-26T12:00:00 123456788 car_mid 2020-03-25T15:20:30
2020-03-26T12:00:00 123456788 car_start 2020-03-25T14:50:30"
| multikv forceheader=1
| fields - _raw linecount
| rename COMMENT AS "Everything above generates sample event data; everything below is your solution"
| rename COMMENT AS "The next line may or may not be necessary"
| eval _time = strptime(Time, "%Y-%m-%dT%H:%M:%S")
| eval actual_important_log_time =strptime(actual_important_log_time, "%Y-%m-%dT%H:%M:%S")
| stats min(_time) AS _time range(_time) AS time_duration range(actual_important_log_time) AS real_duration list(event_name_status) AS event_name_status BY UUID
... View more