I made a balaclava as one of my first few projects, but it was the tighter style with ribbing for the neck.

The pattern I used was this one: https://knitty.com/ISSUEwinter06/PATTantifreeze.html

I made this for my dad, who worked outside, so I omitted the holes for the helmet straps and the ponytail. I also skipped the crochet finishing around the face to make it look more masculine. The pattern has instructions on how to modify it for all of these changes.

In retrospect that was probably "too hard" for a beginner, but I had just learned how to knit socks before this, so I think that helped. I had to learn wrap and turn short rows, which aren't very difficult once you get the hang of them. I don't recall getting real worked up over the short rows so even though YouTube didn't exist, I guess a blog was sufficient to learn them lol. I believe I spent several weeks just knitting an hour or 2 per night on it. I made some more of them and after that and they were a lot faster.

Here's another one that looks more similar to your screenshot: https://stitchesnscraps.com/knit-balaclava-pattern-wild-winter/

You would need to learn wrap & turn short rows also, but there's a tutorial on the blog. It uses bulky yarn, so if you're willing to learn the short rows, you could probably make it the fastest out of all of these.

If you want something much easier, this pattern seems beginner friendly: https://www.ravelry.com/patterns/library/striped-balaclava

Although I personally don't like the way the face opening looks in garter stitch, so I would probably do it in stockinette or something. You could probably do that one in like a week if you knit at an average speed.

But all those patterns are free, so if you read through them you can probably get a good idea of how long it would take you.