For the band it was an insane 2 days of playing the song over and over while moshing and rocking out. There wasn't a lot of down-time those days.
For the film and light crew the work took 4 days, or 3,5 something like... Then of course, the editing is what's taken the longest, although I have no clue as to exactly how long. They don't work on it daily, but a every now and then.
When we recorded we brought in a PA and speakers in which the recorded version was played while we played the song along with it (to get it perfectly synched with the recorded song).
Besides the band and the huge cast of one extra, the crew consisted of a light technician (a real pro, worked with Ingmar Bergman back in the day, and now most recently rented out his stuff to a film crew filming Vin Diesel up at Riskgränsen), a director (Tomi, from Inja) and a camera operator / director of photography.