Time is a real factor. It is not just the space within which things happen. As with the 'people factor' the 'time factor' only needs to be specified when it is a central part of the communication, as in 659 (when is the completion date?).
 

• 59 when?
• 69 time to completion
• 79 right now
• 89 fast
• 49 slow
• 779 make time
• 592 no time to do this
• 95 past tense
• 96 future tense
• 91 present tense
• 989 acceleration
• 94 a waste of time ('time badly used')

Everything takes time so there is no need to include the time element unless this is an important element of the communication. The code 7149 means 'this is too slow' and that is the central part of the message.