elapsed time
noun /ɪˌlæpst ˈtaɪm/
  /ɪˌlæpst ˈtaɪm/
[uncountable] (specialist)- used to describe the time that passes between the start and end of a project or a computer operation, in contrast to the actual time needed to do a particular task that is part of the project(一项工程的)实耗时间;(计算机一次操作的)运行时间