My experience is that roths will flower about a year to 18 months after the new growths are initiated. Having said that I have flowered a roth where a new growth was not even initiated at all.Wow! These are fantastic, especially the last two pictures.
How large are the plants? I have a couple of very large roths seedling that are pushing out 2-3 new growths. I am getting hopeful that they will bloom soonish (next 6-12 months).