20 Minutes of Prayer is Too Little for Missions?

"A young man in Bible school offered to help David Wilkerson years ago when he was ministering on the streets of New York City. Wilkerson asked him how much time he spent in prayer. The young student estimated about 20 minutes a day. Wilkerson told him,

"Go back, young man. Go back for a month and pray two hours a day, every day for 30 days. When you've done that, come back. Come back, and I might consider turning you loose on the streets where there is murder, rape, violence and danger. ..If I sent you out now on 20 minutes a day, I'd be sending a soldier into battle without any weapons, and you would get killed."

You can get into heaven, my friend, with- out a lot of prayer. You can have a one-minute quiet time every day and God will still love you. But you won't hear a "well done, good and faithful servant" on one-minute conversations with God. And you certainly can't make it on that kind of prayer life in the hard places where Jesus is not known or worshiped."

(Perspectives 3^rd edition: "Apostolic Passion" ,Floyd McClung, pg 186,187, 1999, William Carey Library)