The time extensions for dynamis windurst are as follows;
The Manifest Icon around halfway towards the Auction House from the Residential Area gives 20 minutes. The Avatar Icon in front of the Auction house gives 20 minutes. The Avatar Icon just before the SE bridge gives 10 minutes The Avatar Icon at the southernmost end of the consulate island (MNK house) gives 20 minutes. The Avatar Icon at the center of the SW bridge gives 10 minutes. The Avatar Icon at the southern part of the Death House (house of the Hero) gives 20 minutes. The Manifest Icon at the top of the SMN house (northern most house) gives 20 minutes.
A total of 120 minutes.
Of course, the boss gives 30 minutes.