When you walk a dusty road you get dust on your feet. The solution? Wash your feet. When you live in a fallen world, you can’t help but come into contact with the dust of the world. The solution? Enter into the Presence of the Lord and be washed.
Entering into the Presence of God can take time: Time to allow the Holy Spirit to penetrate the hard shell that forms over our hearts as the result of living in this fallen world; time to allow the Spirit of God to adjust our thinking and transform us by the renewing of our minds (Romans 12).
That’s the reason the worship service needs to be open-ended. That is, when we come before the Lord in worship, the Holy Spirit must be allowed to take us where He wants us to go without being limited by our time constraints. That’s why, at least in the tradition I came up in, we sing a song until we are done, or until the Holy Spirit is done. We repeat the chorus; we focus on a particular phrase and sing it over and over again as the Spirit of God leads us; we stop for awhile and respond from our hearts and then sing it again; WE PRESS IN UNTIL WE PRESS THROUGH! We allow Jesus, through the Holy Spirit, to wash our feet. This is the value of taking our time in worship.