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I just came across this interesting farming guide from the Technical Institute in Denmark.
The document is unfotrunately in Danish, but I will give you a short summary:
Beetle density: The optimum density is 0,84 beetles/cm2 = 84 beetles/dm2. Each female will then lay 5-8 eggs per day. This is considerable more than stated by Morales-Ramos et al of 14 beetles/dm2: https://woven-network.co.uk/wp-content/uploads/2016/02/Morales-Ramos-et-al-2012-Impact-of-Adult-Weight-Density-and-Age-on-Reproduction-of-Tenebrio-molitor.pdf.
Larvae density: The first period they grow faster when there is a high density. Optimum is 10 larvae/cm2. The larvae should therefore be placed in a small bin (20x30 cm) the first 4 weeks, before transferred to a larger bin (40x60cm).
Larvae growth: It takes +/- 50 days from egg to harvesting at 30°C and +/- 70 days at 25°C. This is also depending of the air humidity and type of food. Optimum air humidity is 50-70%.
Dry food: Chicken feed is among the most efficient dry food, but dedicated mealworm food is under development that shall reduce cost and improve efficiency.
Wet food: There is indications that Mash, that is leftover from beer production, is more efficient than fruit and vegetables. This coincides with the experience discussed in this thread: http://forum.openbugfarm.com/index.php?p=/discussion/1608/mealworm-diet-sourmash-sourdough/p1
At the end of the document there is a good schematic showing the farming schedule using 20x30 cm and 40 x60 cm Euroboxes.
The group has several projects ongoing to improve the mealworm farming. These projects can be seen here: https://www.dti.dk/specialists/invaluable/38118