Regardless of what type of permanent roof you decide to go with, you can expect it to last a very long time. Metal Pro roofs all come with a minimum 50 year warranty.
When comparing roofing warranties, make sure you read the fine print and understand the details. Many asphalt roofs that carry impressive sounding 25 or 30 year warranties are actually only warranted for 5 to 7 years under regular conditions. Permanent roofs are guaranteed to last 50 to 100 years--with very few or zero conditions. Again, make sure you request a detailed explanation of any roofing warranty you are considering. | 
