Question regarding update requests on the MCC node

So, as I have understood it, the MCC requires an update request to be requested 3 times by different devices before it actually starts to download it to cache it.

1. How many downloads does the MCC node download at the same time?
2. Does the MCC node keep a que list?
3. Does an update request ever "time out" on the MCC node or is it kept forever until reaching 3?

What we have seen on the lab with 10 laptops, it is struggling to get more than 20% updates distributed from the MCC node.
We re-install the laptops with the same USB installer multiple times when Windows reports it to be updated, so all of them are installed on the same build level every time.

4. How many times do we need to "re-install" windows until all updates are cached?