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Hubble Space Telescope Primer for Cycle 22 > Chapter 3: Telescope Performance > 3.3 HST Observing Efficiency

3.3 HST Observing Efficiency
HST’s “observing efficiency” is defined as the fraction of total time devoted to acquiring guide stars, acquiring astronomical targets, and obtaining the exposure for a target. The main factors that limit the observing efficiency are
About 90% of the usable observing time is allocated to science observations, with the remainder devoted to calibration and engineering observations (10%), and repeats of failed observations (~2%).

Hubble Space Telescope Primer for Cycle 22 > Chapter 3: Telescope Performance > 3.3 HST Observing Efficiency

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