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Depends on the aircraft and engine. Some (like my little Rotax 912ULS) has a peak power at which I can only operate at for 1 minute during takeoff. I typically cruise around 70% peak.

I believe in Helicopters you're often running at 90%+ max rated power, but on an engine that's derated from its true maximum power.

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Your Rotax is limited to 5 continuous min. at 5800 rpm, or a max continuous RPM of 5500. There's no setting at which you are limited to only 1 min.

Ah yes you're correct. I use 1 minute as my personal limit so I don't grow accustomed to running it too hard for too long, but the operator's manual indeed states 5 minutes above 5500. I have a fixed pitch prop, which means I typically can only spin the prop at those speeds during cruise anyhow.

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