I'd rather be limited to a set number of raid runs in a given day. Preferably a separation limitation for each dungeon, but that's a bit nit-picky. I don't like to feel rushed through the content by an arbitrary timer. It just makes me want to avoid the content altogether and continue grinding in a party or hunting NMs. And all the content in the game is subject to the same timer.

DO EVERYTHING IN 30 MINUTES OR LESS!!!

What is this? A pizza delivery simulator?

If I wanted to do something in 30 minutes or less, I'd pull out my iPhone or turn on a console. I don't log into a game like FFXIV to do things for 30 minutes. I want content that will stretch out across an evening without being artificially inflated by having you run across the world multiple times.. as is the case with most quests.