During one of our acrylic painting courses, we were lucky to paint a nude model. The poses were very short: 30 seconds, 1 minute, then 3 minutes. The purpose was to reproduce the figure and movement. It was 3 hours of lessons fairly intensive.
First series of exposures: 30 seconds to 1 minute
Second series of exposures: 3 minutes
Third series of exposures: 15 seconds, moving, 15 seconds. The two figures are overlaid
Last ones: 3 and 5 minutes