According to the report there is NO indication that the crew thought they had 30 min dry run.
The other thing I noticed, and I actually teach this to PPL/CPL is "Bucket speed" and the Co-pilot mentioned this (using L/D Max instead), but the Captain was not familiar.
Perhaps this also shows some lack of systems knowledge on a broader spectrum (not just for this crew, but for most of us), showing the need to reduce power and slow down, in case of an emergency? Counter intuitive as well.
Anyways, I am by no stretch of the imagination any sort of expert on this, so I will shut up now.
Cheers
H.