Solo cups, as a first impression says a lot about a grower.
Heres my veg room for dep and full term....about 100+ seed teens 100+ sprouts
150++ clones. I made feminized seed btw.
It's hard to have absolutes in cannabis. A small plant, will sex under 12/12, and then need a pot up, change in this n that to get back to veg. Not every strain handles this stress well. You aren't saving time, but losing some days or a weeks to go back to veg growth, healthy vigorous veg growth.
I have seen strains declare female during 16 hr lights days, but in 3-5 gallon pots and chest high. Just a hair at a mid level calyx, that pale greenish white hair sticks out you know. But that only accounted for 40% of the females in that batch had to go outside during 13.5-14+ daylight to declare all the rest.
I start straight seed under 16/8 lights in feb or march, into a hoop house in april days are 13.5+ they declare 98 % (there's some last to declare plants that dont show, treat them as males dont risk pulling up a 5 pound male in August). There's no stop grow this way, stop now go back to growing this way, thats potentially 1-2+ weeks of not staying on a veg growth curve.