Why is he worrying about enough diamonds? At the party's level, they should be overflowing with cash and diamonds.
edit: Oh yeah, as mentioned on the GitP forums, the party went on a spending spree at the Gnomish city and are light on cash at this time.
http://www.giantitp.com/comics/oots1029.html Though other sources of cash may show up, another person also mentioned that Hilgya has a bunch of cash, so....
Will they be able to raise Durkon since he has been dead so long? I remember with Roy they had to use a higher tier of spell because he was basically a skeleton.. they even had to rearrange his bones after he was blasted to bits as a golem IIRC.
I doubt there will be much of Durkon's afterlife shown since they should raise him fairly quickly (don't they only have a couple days before the world is unmade anyway?) while Roy was dead for months and months (and spent a lot of this time climbing an endless mountain without noticing the passage of time O_o)
Edit: nvm, forgot that vampires turn to dust.
I don't think they know for sure just how long they have before Xykon's plans to do something with the world (not sure what he's planning to do with the gates, but it would definetly be the end of their world as they know it. Plus there's that revelation of another world within the Snarl.), they just know they have to hurry. However, as far as Hel's plans to end the world go, they seem to have just killed that.