Computers are (almost) always available, whereas people are not. For humans there is a discrepancy between concept and perception of time, also when people use computers. A few seconds waiting for opening up a program can be perceived as very long. Computers do not have this discrepancy in perception. Time functions in computers on much smaller scale as they are much faster at what they do then human beings can be. Programs and networks of computer do have time response issues though. Response in time is one of the things on which you assume to be connected or assume another program is ‘alive’.
Time is an issue because of a-synchronicity. In distributing programs time is an issue because the same time cannot be tracked on different locations. For computers, of course, time is not as influential as for humans, as in day- and night rhythm.