He was an elderly priest, which made me even more confused. Maybe he was one of the priests who was ordained in the new rite and converted later on. I don't know. He was only a visiting priest and he wasn't there to say Mass. I don't think we have to worry about the Holy Water being real, because it would have been blessed by our regular priest. I'll hold on to the medal and give my sister the scapular with the crucifix. I will give them to Father next week and, like you said, I'll ask him to give them back to me after he has the time to do the blessing.
15 minutes seems extreme though. I found the blessing online and it looks like it should take 5 minutes at the very longest. Here is what I found:
Medals of St. Benedict may be blessed by any priest (Instr. Sept. 26, 1964). The following English form may be used.
V. Our help is in the name of the Lord. R. Who made heaven and earth.
In the name of God the Father + almighty, who made heaven and earth, the seas and all that is in them, I exorcise these medals against the power and attacks of the evil one. May all who use these medals devoutly be blessed with health of soul and body. In the name of the Father + almighty, of his Son + Jesus Christ our Lord, and of the Holy + Spirit the Paraclete, and in the love of the same Lord Jesus Christ who will come on the last day to judge the living and the dead, and the world by fire.
Let us pray. Almighty God, the boundless source of all good things, we humbly, ask that, through the intercession of St. Benedict, you pour out your blessings + upon these medals. May those who use them devoutly and earnestly strive to perform good works be blessed by you with health of soul and body, the grace of a holy life, and remission of the temporal punishment due to sin. May they also, with the help of your merciful love, resist the temptations of the evil one and strive to exercise true charity and justice toward all, so that one day they may appear sinless and holy in your sight. This we ask through Christ our Lord. R. Amen.
The medals are then sprinkled with holy water.