We've been doing the Rosary for Life for several years. For a couple of years I did it at 11am with a friend, then no one called me the following year, but last year, the lady called again, and asked if one of us could do it at 3am with a friend whose wife was going to be out of town (they usually did it together). So SirKit said he'd do it with Brian, and I went along with him. This year Brian and Pat are doing it at their regular 3am time, and SirKit and I are doing the midnight slot. We've found that doing each of the four Mysteries of the Rosary fits right in that one hour time frame.
The 24 Hour Rosary and Adoration begins after Mass at 8:30 on Friday morning and ends with Mass at 8:30 Saturday Morning. They always plan for at least two people to be there at all times, just like they do during their regular Friday Adoration. It's always held on a Friday during Lent.