It usually takes about fifteen minutes to quiet the business of life and enter into rest. But Jesus is the Lord of the Sabbath, and He wants you to enter into His rest. The fruit of the Spirit is love, joy and peace, so we need to take quality time with Him. You cannot force or hurry this. The idea is not to  "get" something but to "be" with someone. Take time just to be with Him; to love Him and let Him love you. If you fall asleep, that's OK. If you are interrupted, you can always come back for more. You will know when your time is finished.  You will feel a satisfaction in your heart and a release to go and get on with life.

Occasionally people can become quite emotional during soaking prayer. God may want to touch deep places in the heart. There are often areas of past wounding where we are very reluctant to go. That is often the very place that the Lord wants you to revisit so that He can bring freedom and healing to areas of fear and pain.  It is helpful to have friends and even experienced ministry people in the room so they can love you through this and help reassure you to go ahead in faith in order to, so as to bring closure to these areas.