Q. May one daven Neilah at great length, pronouncing the words with great concentration and adding many requests and supplications, even though this will cause him to miss saying the selichos of Neilah and possibly not to daven Maariv with the minyan?
Or should one rather shorten his supplications in order to participate in selichos and Maariv?
A. Horav Shlomo Miller’s Shlit’a opinion is that one may extend his Neilah amida with great concentration and adding many requests and supplications, but he should daven Maariv with a minyan.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a