Sounds like a challenge to run Insane Dungeon!!!

Tank in beak, healer and 4x rdps it should be like 10 mins.

I think they can all be done in 10 minutes, with exception of LI which can be done in 7 or so.

But like Wadi mentioned, it also depends if the party has a debuffer class or if they know how to debuff bosses in general.

And how long would you say it takes an average group of players that never played together before? Random pickup group type thing.
I know it's like asking how long is a piece of string, but just an idea really.

Random party can be around 12/13~30mins in average for DI (can even last longer if their party cant hold out 2nd boss LOL). for LI average around 10~25mins. Thats is my opinion o.o

Random party for DI (once) turned into 1hr...it's those members who underestimate the dmg from the mobs and likes to lure to Golem them and the inexperience of the healer that made that one 1hr.

But most times the runs last less than 15-20 mins.

*_* I remember running DI with a random party, mostly first timers -- which took more than 20 mins. Same reason as Anna stated where sometimes people just lure everything without warning xD

I'm pro at luring everything without warning anyone~

Anyways, yeah i'd say most full parties about (not full of Ray's) probably about 15-20 minute runs (30m+ if inexperienced). Think WGI takes 15 minutes to Trio with a high dps lock, 10 minutes if have 2 locks. And think Li/Di has similar times usually. Mainly each dungeon has that one hard spot or boss that tends to slow people down and eat up time. For Di, it's Sharloch, for Wgi, it's the flowers. If party can handle them, dungeon goes quick, if not, dungeon can take many retries and a long time.