I'm finding that parties just die quickly if duty finder fights don't go well right off the bat.

I don't know if this is a bad idea, but it's an idea.

I was thinking what if you added a stat bonus (10%(just throwing something out there)) if the party has died over say 3 times in the first 30 min. Upon the 3rd+ wipe if it's 30 min into the fight it would give you the boost.

I feel 30 min is a pretty good time to aim for. it's far enough away, that people wont take advantage of it, and close enough that it would give parties a short term goal "see how the DD is going for the first 30 min" try it once and see if it's easier.

I felt 25min was a better number, 30 just sells better, I like 25 though.