I would say that the four minutes - minus the time it takes to say it in English - could easily be afforded at any Mass.
I contend that a sung Kyrie on the Missal chant is shorter than a spoken one, because it does not include any off-the-cuff improvisations.
The Priest, or a Deacon or another minister, then says the following or other invocations* with Kyrie, eleison (Lord, have mercy)
Sample invocations are found in Appendix VI
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