Unquarantined hardware requirements

[GraniteKeep]

In the "Hardware required" section, the protocol states that one of the two unquarantined computers should be

a computer that you do not own (unless purchased brand new), or that has not spent much time on your home or office network

How much is "much"? Can we come up with a more definite statement? I imagine a user scratching their head while looking at a laptop, thinking "well, it hasn't spent much time on the network... Has it?"

The protocol later states

It’s not technically ownership that’s important. But computers you own are more likely to
run the same software, have visited the same websites, or have been exposed to the same
USB drives or networks – and therefore to have the same malware.

So is the requirement:

The computer is not to be one used by the person implementing the protocol

or

The computer is not one that has been connected to the person's home/office network

or both?

For example, A user's son's laptop could spend all day on the user's network (different user, same network), or the user's laptop could spend all day on a workplace network (same user, different network). Both could satisfy protocol requirements as it stands.