Just a note, based on my last IFR training flight (where my instructor failed to activate train mode and turned one engine to IDLE).
The engine has a 2.5 minute limitation and based on what we got back from eurocopter, transmission has only 2 minute limitation (not noted in any book to my surprise).
Our flight on one engine lasted for 1' 52'' so we avoided the 2' limitation by just a fraction. The engine was limited by the amount of TQ and time. 2,5' being absolute top, but at a TQ value we were at ~112% (dont hold me on that one, takem from what i remember) ment that we just made it with a 1' 52'' so the engine didn't come off. The transmission has a notice for this event, as if one XMSN chip light comes on, the transmission is of to germany.