Will do Ray, also how long does it take the brines to reach adult stage?
That is a hard question to give a direct answer for. There are so many variables like temperature first off, density of brine, food density, feeding frequency, food quality and husbandry to name the more common ones.
Under ideal conditions as in rearing systems in aquaculture institutions, they go through all their 15 or so moults in about 8 days.
For the hobbyist, expect a range of about 20 days to 8 weeks, again because of the variables.
At 80° with a reasonable density and feeding 3 times a day, 2 weeks or thereabout would be expected. Sooner for low density
I grow mine at 68-69° (bacteria control for me) and feed twice a day and it usually takes 6 to 8 weeks to get to the final Instar stage. My density is 12 grams of cysts to about 20g (26g container) of water at 1.017.
Now all that being said, they are basically close to full size earlier and it's not a case of waiting until the final moult before you can use them. I use them at all stages from a few days old to 3 or 4 months old.
Speaking of moults, because of all these moults the brine go through, you end up with a lot of the decayed moults contaminating the culture water. Most recent moults basically look just like dead brine shrimp but they disintegrate rapidly into small particles.
I do a vacuuming of the bottom after letting settle for an hour or so and put that vacuumed water in pop bottles to allow settlement and siphoning off of brine that get removed by cleaning so they can be returned to the rearing vessel.