After Jesus ascended to heaven, the disciples returned to Jerusalem.
Acts 1:4 (ESV)
All these with one accord were devoting themselves to prayer, together with the women and Mary the mother of Jesus, and his brothers.
11 disciples + Mary +more women + the brothers.
How do you picture it? Each in their own corner, praying? Twenty people in a circle, taking turns?
Maybe. But I picture folks coming and going, doing chores and catching some rest. Sometimes two or three praying quietly. Sometimes the whole group eating and praying. Many or few, praying together — in one accord.