It's still mostly one per day per channel, more or less. It's just that they have many channels

They have like a hundred employees, which makes it a lot easier to figure out. Though some of those employees aren't directly involved in creating videos, such as doing accounting or creating the many kinds of custom merch that they sell.

They have a bunch of employees doing specialized roles. Not just the usual roles like editing or writing, but they also what they call a "lab" that does stuff like identify findings about tech. But even with so many employees and all the specialization, they're still clearly rushing. Eg, if they make a massive error, rather than fix it and do a reshoot, they'll release it with the error, which is a terrible approach.

That's exactly what happened in their biggest controversy with an expensive water block cooler. They used a completely wrong graphics card despite knowing that it was completely wrong and with an incompatible motherboard, then spent most of the video bad mouthing how it didn't fit the motherboard or card instead of recognizing that they needed to just identify a compatible board, find the right card, and redo the shoot.

Hbomberguy

One video in six months, if we're lucky.