I'm currently using a 10m (~33ft) HMDI cable to connect my desktop PC to my TV @ 4k/60hz. It works well without HDR but does cut out from time to time with HDR enabled so I mostly leave it turned off @4k.

I spent quite a long time researching what cable to get as the standard does not really cover cables longer than around 5 meters, and most "legit" cables explicitly states that they can't provide 4k/60hz at lengths longer than 5 meters so you mainly have to go on customer reviews. The price does not necessarily indicate what the cable is actually capable of so getting something that works requires a lot of research... (+ YMMV)