The quick and glib answer is that all sprints have the same duration, so velocity would
always be the same if you measure actual hours. For example, if you have four people
working one-week sprints, then every sprint should have a velocity of 4 × 5 = 20 days. If the
sprint includes too many features, you might need to drop some of them to fi t in the oneweek
time box, but the velocity would always be the same.