Rav Elyashiv and the Klausenberger Rebbe's Sheva Brachos
Invited to recite a beracha at the Klausenberger Rebbe's last Sheva Brachos, Rav Elyashiv declined over the time of sunset, until the Rebbe promised to finish early.
Rav Elyashiv once related that the Klausenberger Rebbe invited him to the last Sheva Brachos meal being made in honor of his daughter (who married Rav Dov Weiss). He was to be honored with one of the Sheva Brachos. Rav Elyashiv politely declined, explaining that presumably the Sheva Brachos will be recited way after sunset in accordance with the chassidishe custom that halachic nighttime occurs 72 minutes after sunset. Rav Elyashiv felt that according to his custom, Sheva Brachos recited after sunset would be considered blessings in vain. The Klausenberger Rebbe assured him that the Sheva Brachos would conclude before sunset, and then Rav Elyashiv graciously accepted the invitation.