When to stop praying:
When do we stop praying for something? Jesus' answer - you never have to.
A good example of this comes from the life of George Mueller.
Mueller was an extremely dedicated Christian who ran an orphanage in England in the 1700's. He was known for having a lot of faith in prayer. He never asked for help or money - he just prayed it in.
Early in his life he prayed for 5 of his friends to be saved. After 5 years, one of them became a Christian. After 10 years, two more accepted Christ. 25 years went by, and the fourth was saved. For the last one he prayed until the year he died but never saw the man become a Christian. Yet 3 months after Mueller was buried, this man also was saved.
For this last friend, George Mueller had prayed 52 years. You never have to give up in prayer