I went back to the states for a bar-mitzvah about a year and a half ago. The davening went from 9 to 12, and it was painful to sit through all the extra stuff. Mee shebayrachs that lasted 5 minutes apiece. A 30 minute drasha.
Is the day so short that being in shul an extra half hour, on Shabbos no less, will interfere with ones schedule?
I have news for you:- A Resounding Yes!! People who sit at these “never ending Minyanim” on Shabbos morning:- 1) Most of them end up eating before Shul, or if they don’t eat, then feeling so weak, and not eating before Chatzos when on EST; 2) Often will miss Zeman Krias Shema, and many people not aware to say Shema before going to Shul. 3) Most of them don’t end up eating Seudo Shelishis, not even a snack for Seudo Shelishis; Most of these shoules that go from 9-12, have a massive Kiddush afterwards, where people are so hungry that they stuff themselves, but since no Challah nor Matzo, so doesn’t count as a Shabbos meal, since cannot eat Seudo Shelishis before 2nd meal, and 2nd meal there is no way to fulfill it without bread.
Furthermore, the extra time is Mishebeirach’s & Chazzonus & maybe also many Hosafos, but not a slower Silent Amidoh nor a slower Pesukei d’Zimro. & most of them won’t remember the rabbi’s speech from an endless Shabbos morning.
B’H I attend an early Hashkomo, eat at a normal hour in the morning after davening with Motzi, and have Seudo Shelishis early afternoon, and am even able to have apetite for Melave Malka, and spend the morning with my Seforim & children, and everyone loves the arrangement we have.
As for weekdays:- If a man hasn’t arrived at least 5 minutes before commencement time, by definition, he has arrived late. Being on time, is defined as being ready with your Tallis & Tefillin on, so you can actually begin the Davening as soon as the Chazzan begins services. Preferably, if one has already recited Birkas haTorah & maybe also the 15 Berochos which the Chazzan then says aloud, then at least there is some chance of keeping up with the Chazzan.