Check out this cool video, courtesy of The Oregonian.
The video was recorded on January 8th, 2016, shortly after the Blazers lost to the Golden State Warriors 108-128. The crew at the Moda Center went right to work, converting the basketball court into a hockey rink for the Winterhawks, who were playing against the Kamloops Blazers the following night.
According to David Holmes, the Operations Manager at the Moda Center, it takes between 4-6 hours to convert the arena from the basketball set-up to the hockey setup.
I would suspect it takes just as long to convert the court into the Arena Football set-up; perhaps even less converting hockey to arena football.