Felicity

1 x USB 3.1 Gen 1 port(s) (1 at back panel, , Type-C)

Yes. It is fine. Note you should try and be picky on your USB cable; quality does matter. A poor quality one just will have trouble pushing the same amount data NONSTOP for SO LONG. It will degrade fast. Adapters do too. it pushes a LOT of current. My motherboard trips overcurrent sometimes with the quest still plugged in... also the oculus software is a bloated mess of garbage

Don't bother with c -> c cables, most are usb2. usb3.0 c -> c is always too expensive. 

Yes usb 2.0 works with link, but it's just not good at all. Anyone who says the quality/input lag can't be seen or felt is blind and brainlagging. 

Gen 2 sometimes has more issues with oculus link than gen 1 iirc. It's been a while. I dropped the quest for the index as fast as I could.

That anker one above ^ is what I used and it's fantastic. Along with an actively powered extender, you get a very long cable.

Great call. They said I have 15days 

i have barely enough space too and you'd be surprised at how quick a short cable will get yanked if you do anything that involves moving around at all, even just 2-3 meters. The extender is good for that since it will yank out of the extender and not the headset/pc. An all in one extender won't have that positive tho.

Granted, I also did the silly hooks in my ceiling thing for pulleys so I could center the drop of the wire and run it along the ceiling and have the center of 'gravity' be in the middle of my room if I wanted to tryhard the setup. (doing all that was fun tho it was a project and got me through the insanity of early quarantine) 

it'll work but I tried to stick my edit at the end there, 6m is just not long enough. I needed at least 10m to be comfortable, or 16m for a well-routed cabling situation. 

It will work fine tho if you just want to try it and then see how much length you need (blush). 

This is most likely a ground loop issue and interference with poorly integrated electrical grids in your home/area. 
 
I will note that adding an external sound card will not help this, and often will make it worse- that ground loop interference is now no longer being shielded by the motherboard's own shielding, and they generally have none of their own. You can get isolators and shielding for this but I never had to and don't know what to go for.
 
I do wanna note that several Xonar cards (as mentioned above) in my humble opinion greatly improve sound quality over onboard- especially on budget motherboards, budget motherboards (under $300? probably bad onboard) slack on the clarity. Those xonars are the most affordable onboard if you really don't want an external DAC/AMP. The DGX is probably the best for your purposes, but is out of your price range. The DGX has a good amp system, and a few features that make things like streaming much easier.