Normally on Sunday mornings we worship in song around 30 minutes. We are always open to the Holy Spirit and if He is still ministering after the "set" time for worship, we will follow His lead and continue in worship.
Sunday nights we have set aside for prayer and worship and we usually worship anywhere from an hour and ahalf to 2 hours, or for as long as the Lord impresses upon our hearts to.
Wow, we are way different from the majority of those of you here. Our service is a blended service. On a typical Sunday we have an opening hymn with the organ and then the worship team plays 2 opening songs. Then we play between 2-4 songs throughout the service (communion, offertory, postlude, ect.) The amount varies from week to week.
Usually around 30 minutes. Once in a while, we will have worship music for the entire service. Those are really nice, when there isn't so much of a time constraint. It allows for more improvisation and flowing with the Spirit... more instrumental.
Where we used to live (a different state), our church there had almost no limitations on when things happened or how long stuff lasted. It was terrific to have that level of freedom, but those of us with small children just had to get up and go after a while. The young ones must be fed!
I look forward to the day when we are not concerned with time so much and just spend hours worshipping before the Lord, ministering to Him, listening to Him and receiving from Him as we spend more and more time in His presence, loving Him.