Observation time refers to the specific amount of time spent closely watching or examining something or someone in order to gain information or knowledge about them. Full definition
As mandated by state law, each lesson consists of 50 minutes of drive time and 50 minutes of observation time for each student. (colonialdrivingschool.com)
Over land, however, much larger uncertainties are present, and complex models are used to try and adjust for changing observation times. (carbonbrief.org)
Several of the astronomers who obtained observation time for this cycle attend the conference. (alma-telescope.jp)