WordNet (r) 3.0 (2006):

access time
    n 1: (computer science) the interval between the time data is
         requested by the system and the time the data is provided
         by the drive; "access time is the sum of seek time and
         rotational latency and command processing overhead"

The Free On-line Dictionary of Computing (30 December 2018):

access time

    The average time interval between a
   storage peripheral (usually a disk drive or semiconductor
   memory) receiving a request to read or write a certain
   location and returning the value read or completing the write.

   (1997-06-14)