HI notrub,
to All Things Plants!
I found three listings for this Agave in our ATP database:
Queen Victoria Agave (Agave victoriae-reginae)
King Ferdinand Agave (Agave nickelsiae)
Variegated Queen Victoria (Agave victoriae-reginae 'Variegata')
There's some information regarding propagating from seed but nothing that gives a length of time for seedlings to reach a certain size. I remember back in the early 1970's I grew some cactus from seeds and it seemed to take forever for those little stems with two leaves to take on the actual shape of a cacti. I don't remember how long it was and I ended up losing the little things to an unexpected freeze when we were out of town. If you have any photos of your seedlings to share, they'd make nice additions to our database!
Again,
and I hope you have fun browsing some of the forums that you find of interest!
~ Lin
