This will vary from place to place as well as your geographical location. The further north you go, the shorter the life span of a metal roof is going to be because of all the snow and ice they have to put up with during the winter months.
In places where it doesn’t snow or rain very often, they can last for many years without any problems arising at all. This is good if you have a lot of money invested in your mobile home and don’t want to deal with having a new one built every couple of years because of a lack of maintenance on your metal roofing materials.
It’s also important that you put some thought into what type of style you choose before making this investment because it will greatly affect how long your roof lasts.
If you go with a metal roof that is not rated for high wind speeds, then this will make it much more likely to be torn off during severe weather. Although your chances of having major damage done are much less if you live in an area where hurricanes and tornadoes come through frequently.
There’s also the option of putting solar panels on top of your home which may or may not have any effect on how long your new metal roof last depending upon where you live and the amount of sunlight that hits it each day.