Hi mate, its depend on the strain some are faster some strains take longer, I would say it will take about 2 weeks for the transition to flower. Happy growing 😀
humm, usually in 7 to 10 days you will see some pystils showing, You can already notice some color change, bright green where your buds will take place.
2-3 weeks.
It won't happen overnight, but it will happen soon enough.
Plants need time to react to hormonal changes brought about by the different light schedule.