I'm starting to breed silkworms and they're a 6, because if you don't clean anything that has germs on it and put it near them, they'll die. I previously attempted to keep them and it went decently well, so I'd say all that time adds up to about two weeks. I only have one adult beardie, so this was my best option. I bred hornworms before, but there were so many that I couldn't feed/sell them fast enough. (They're about a 4 by the way)
I've bred Discoids, and Dubia and I'd consider them maybe a 3 or 4 due to the fact that cleaning the bins is a huge hassle every couple of months. Then again, this was biased for me since I was allergic to them and I couldn't breathe if I was messing around with it too long. Bred roaches for about a year.
I also currently breed Superworms, and they're probably a 1-2, all I do is drop carrots in a couple plastic shoebox every 2-3 days, and maybe once every 2 months I sift out the "waste" and with a mesh strainer it takes me maybe 2-3 minutes per box? Bred supers for 1.5 years.
I feed 1 adult dragon, but could easily manage more mouths with my production rates.