that is up to you my friend. how tall is your tent , minus light and pot and. remember she will double almost triple in size(sometimes some strains. ) … figure out how tall you want her at harvest cut that in half and that’s were u flower at.
from top of dirt to top of bud my plant is may be a foot, but she is about 2foot x 2foot wide all tops . and my bigger buds are layed over .
Viktor cut that top bud off and watch the thing just bush out with thicker buds and a bushier plant… I would bend the plant also , this leave more light for the lower budding branches - also when the lower branches start to bud out clip the tip and again watch it get thicker and bushier…
MotaMan