The standard time for the Benchmark assessment is 50 minutes, as mirrored from the official Microsoft Office certification exam. However, Teachers may choose to customize/alter this time, as shown below from Groups Manager in the Teacher Panel page. This can be done for the entire Group - all Students - or per Student (see the Group Students tab in the image).

Related Support article reference:

https://support.jasperactive.com/en/support/solutions/articles/36000020775-using-the-teacher-panel-using-groups-manager-modifying-assessment-time-limits-