Well I did a trial run of a dungeon today that I think went really well.
I put together a "maze" for a hack and slash dungeon crawl. Minimal storytelling. Just to see if I could get the numbers to work, and how easy it would be to guide the party around.
I managed to fit in 10 of the encounters I planned (out of 15), and definitely got all the interesting ones in.
Favourite encounter of mine was the hydra. I think we'll be seeing another one of those in the campaign. :)