"Special Afterburner Mode"

So shift - e is special afterburner mode, which gives you more power.

My question is, is there any limit to how long this can be employed for?

I flew around with it on for about 3 minutes and saw no damage whatsoever.

Wouldn't the engine nozzles melt or take damage? Is it just not modeled?

After max using engines will lower at 80%.

10min max or 10min total in flight(s). If you use it, don`t forget to do repair your Su33 to "reset" that time.