I didn't take good records of when I started this in flower, but can say it is FAST once you turn it to 12/12. I am running Queen of Soul now as well and flowering fast as well but definitely a bit slower as I started these around same time in 12/12.
Update 08 March 2021 - Pulled round two of my Apollo XX from clones and boy what a difference! Look as amazing as it smokes and after getting some advice from Mr. Soul, I am vegging out my next round to 24" in a 5 Gal pot (due to my grow tent size). Mr. Soul states that growing out to 36" in 10 Gal Pots you will get around 50" plants with up to 8 Oz yield. I believe it from the yield I am getting from smaller plants and hoping for a good 4 Oz at half the size.
Update 28 Apr 2021 - After several runs now and 1 in 3 Gallon and 1 in 5 Gallon cloth pot flowering at 23" and 24" respectively. Both stretched about 14 inches and filling in nicely. Got these dialed in now and such a great plant to grow. The smoke is amazingly good and smooth from past couple of runs and I expect these to be the best yet now I feel like I dialed them in. My first runs left me thinking these are so-so, but last grows have proven to be another keeper in the garden. Easily two ounces per plant this run.
Smoke is nice and smooth and you get an occasional haze hit. Great up buzz, great for playing Music, working outdoors. Fantastic all day smoke that after almost exclusively smoking Apollo XX and Queen of Soul for months now, this strain is among my all time favorites. VERY high ceiling - most strains by now I would be bored with. Cannot understand why you don't see it in dispensaries.
I added in new pictures of the Flowers and a couple back of the leaf shots to show the amazing crystals that develop even on the leaves. The Kief is incredible and pours off the dried flowers! Perfect for bubble hash.
You can purchase directly at Brothersgrimmseeds dot com. Almost ready to flower, Killer Queen and Grimm Glue, with DTC99, SD99, and Strawberry Cough x Vortex all from Brothers Grimm shortly behind those two - Grimm Garden summer and all of my plants from Grimm are looking incredible!