with some strains it takes a while to tell and even then some you wont tell until up to the first week of flower but ive had a few that would show male sacs in like week 4 just depends on strain but after a month of veg and u still cant tell start to flower
yeah last time i found a seed in some good weed was months ago but i had a stash around my room i just started and got some pretty good genetics with only one dying and one being a male but i have a really good one that i accidentally turned hermie but luckily i want some more seed of that...
yeah measure from bottom the the highest point and for an indica dominant it will generally be height x 1.5 but if its a hybrid x2 give or take for flower