Perhaps you believe that priests are supernatural beings.
Have you any idea what a priest does? So, can they not, like the mere mortals they are, tire both physically and emotionally.
A priest is a man of prayer and I’m sure he’s no objection to saying his Office. His Breviary doesn’t tie him to the church. But, he’s entitled to a break for one day per week. Most priests take this mid-week so they’re not depriving the faithful of obligatory Masses.
It is easy to demand the availability of a priest 24/7 when you’re not the one having to live that experience.
I’m not convinced of the 30 minutes unless you want a priest that comes totally unprepared into the sacristy, vests, rushes through Mass, back into the sacristy, throws of his vestments for the sacristan to put away and off he’s gone. I thought you’d like him to make prayerful preparation for and thanksgiving after Mass. And, of course, there’ll be no parishioners saying: “Oh, Father, while you’re here have you got a minute …”.
I certainly don’t begrudge my priest his day off and will continue praying for vocations. In fact saying that reminds me he’s doing the work of six priests. If you find that incredulous think of this. He serves what was until quite recently three parishes; each one had two priests.