I think you're going to need more airflow than just open windows. You can probably rent a large air mover from your local home improvement store in order to circulate lots of air around. Alternatively, try getting in touch with a local company that deals with cleaning up basement floods as they will have the same type of air movers.
You're looking for something like this:
Air Mover http://www.homedepot.ca/wcsstore/HomeDepotCanada/images/catalog/AM2560_beauty_L_300_4.jpg
