Dubia just like several other animals reproduce according to their environment.
if you give them a perfect warm cozy place with high protein food and such
they'll turn around much faster (but this can cost much more).
lower your overhead and ... slower progress.
I got a very small starter (10) 3 years ago and it took two summers to really have enough
where I felt that it was alright to start feeding them out (and then I only used the males)
Now I've got enough turning over that I'm using only size selected juicy nymphs.
They're kept in a large storage tub with several egg flats and empty paper towel rolls.
Currently, I have enough to divide in to 3 more tubs if I wanted too.
I've seen the "fancy" setups that some have posted and decided people can
make do with much less tinkering... their needs are VERY BASIC.
For my environment, the dubia are 4x more productive then the discoids
but much less than the lobster roaches that NOBODY ATE and stank too. (ymmv)
Sadly, some of the panthers don't care for the dubia I've raised
but the veilds are getting used to munching them down as a juicy treat.
In short, they're not pest insects.. therefore.... lower reproductive rates
and less adaptability to the home... if you give them a stair or ladder they can climb
but not up clean non grip surfaces.
If you feed the pre mature nymphs out you stand a better chance of none escaping
and living long enough in the home to breed
(assuming you lived in a suitably messy roach habitat.

enjoy.