915 Turbo limits?

Mike wrote:

Not sure how a "time limit" would even work on the turbo. The turbo is not something you can turn off. It's always running in normal cruise power settings. 

Yes, I was not clear in my question. I was more wondering if running the engine at full throttle for extended periods of time was hard on the turbo if the engine was under the RPM limits; Like temperatures and such but my question was answered.