In general, size matters. The larger the surface, the longer the task. However, especially dirty surfaces might need more application than others. The rule of thumb is that every 25 square meters will take around 45-90 minutes dependent on the level of dirt needed to be cleaned.
A straightforward swipe, wait, and will take 45 minutes. This includes application; wiping the surface, then waiting the 2-3 minutes, and then wiping the surface after completion.