This is probably a simple oversight, but the ROSCon18 site seems to be inconsistent regarding the length of the slots for presentations.
In the overview it states:
The bulk of the program will be 30-40 minute presentations (some may be longer or shorter).
Then under the Call for proposals, we have:
Recommended duration: Short (~10 minutes), Medium (~20 minutes) or Long (~30 minutes).
I’m guessing the 40 minute slots are not going to be used this edition of ROSCon?