To those saying let it run, think about the height, after flipping the plant can double or triple in size. So if you flip at 30cm (12inches), the plant will end up roughly between 60-90cm. The height of the grow area is only 80cm, so that's not going to work is it. There's pot height and distance from canopy to light to take into consideration too, The pot is probably 20cm high. To give an accurate idea of when to flip we need to know what light is being used and at what distance.
There are grow methods like sog or scrog that could of worked in that grow space. You can always super crop too.