I was told that it was possible to break the RB-211 down so as to ship it as wide body belly cargo. A useful feature. I remember a 767 that got stuck in Honolulu for a week when it needed an engine change. They had to charter a 747 cargo flight to ship both engines back and forth, very costly.
The industrial version is used in gas pipeline transmission and the continuous operation time is measured in years. Obviously it is not as stressed as it is in aircraft use but one of the engineers involved in the Alberta gas business told me that they had one of the highest time 211s and it had operated without any real stoppage for years.