Tell me to 'Git Gud' all you want, but 15 minutes to complete a GM is crazy to me.
Take Inverted Spire, for example... By the time you have done the opening section, got past the locked gate, got to the tank section & crossed the battlefield, THEN cleared the three plates, most people have taken up those 15 minutes, and you're only half way through the Nightfall!
You then have to navigate the rest of the Nightfall flawlessly because the game removes all of your stored up lives.
Pre-Edge Of Fate, we had 45 minutes to complete a Grandmaster Nightfall and now we have 15 minutes? Make it make sense. Please.
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Luckily i used to do speedrun gms so i just summon upon that to get it done in under 15 minutes lol (but no seriously the time is way too short for things like inverted)