We guided our client through an iterative conception process, in sprints. The result was 4 sprints of 2/3 weeks – including users tests - in 3 markets. 
Design deliverables: VOB/VOC Personas Storyboarding Prototyping User tests 
Key learning: 3 weeks is the optimal pace to run sprints which include user tests. 3 markets test is really a luxury compared to the final added value