run time

Short definition from Wiktionary

Noun

1. 1
   The stage during which a program is executing.
2. 2
   The amount of time during which a program is executing.
3. 3
   A software component designed to support the execution of computer programs.
4. 4
   The length of a film, television program or audio track in minutes, usually with end credits included
5. 5
   Alternative form of run time.

Adjective

1. 1
   Of, relating to, or happening during run time.