New Mexico archdiocesan preachers on notice: no more than five minutes. From the church memo:
(The chancery had) received reports of some homilies going on for well over the 5-minute limit set by the Archbishop.
This not only increases exposure time [of the coronavirus] to others, but increases the discomfiture of many congregants, to the point of some not attending Mass because of it.
If such homilies continue, [Archbishop John Wester] will consider severer [sic] actions for subject clergy, up to and including possible suspension of the faculty to preach.
Having been a parent, I don’t find this method of persuasion is always effective. Maybe something more positive and proactive: add up all the preaching minutes, divide by number of Masses. Give some award or reward to the average of 5:00 or below. I also wonder if this warning isn’t addressing the more serious problem of fifteen-minute homilies. Maybe Archbishop Wester would settle for seven or eight if his clergy could avoid the creep to twenty.
Seriously on this topic, I think it takes discipline to master a homily topic and hold to five minutes. One of the first things I wouldn’t do is waste fifteen seconds informing or reminding people that the bishop said I have to keep it under a time limit. (Cue another fifteen seconds wasted for applause.)
Catholic Sensibility 
It takes much more effort to speak concisely, an effort many preachers are not willing to make. (Note to preachers: joking about the inordinate length of your homilies makes continuing to do so *worse*. That kind of joke effectively says: “I know I have this habit you hate. Screw you, I am not going to change. Because I have the power and you don’t.”)