Probably the best thing created to be called simulator/game.
Whats Microsoft, Asobo Studio and Blackshark AI have done to pull this behemoth off is nothing but incredible work. They have literally put the whole world to scale and that has never been done before on this earth for a simulator game.
I don't care about download size and time; if you want rain prepare for mud too and it only make sense that the game is over 120Gb in download size, considering whats this simulator is about and what it can deliver.
RECOMMENDATIONS
If you are not a pilot; Flight Training is a must and it is fun too. you are going to need to know the basics of flight or civil aviation. This will make sure that you don't get frustrated. Because this is a simulator, that means it mimic real life you will need to learn how things or, the terminologies and and all important parts of planes e.g: Ailerons, flaps rudder etc, terms as Attitude and altitude. DON'T SKIP TRAINING.
Start with a propeller plane, it will ease you into the experience before you get to jets and airliners. Taking of is always easy, but having a comfortable flight without proper understanding is not possible. Last landing is behemoth task; this because you need to control things like flaps and more. Understand basic physics.
LASTLY invest in a HOTAS( hands on throttle and stick) it will make you experience much better compared to playing with a keyboard and mouse only; I started like this but for a smooth and immersive experience; a HOTAS is a must, even a beginner HOTAS like Logitech X52 HOTAS is notch up from keyboard and mouse.
I did even mention that this game also simulate real time, or real world weather, If it is raining where you happen to be flying, it is also raining in the sim, That is insane the collaboration between the parties involved was a match made somewhere special to give us such an experience. Visit bespoke cities, airports, national parks, natural wonders like the Mt Everest and other wonders of nature.
Lastly have a good internet connection if you really want to be able to get the best photogrammetry experience because this game download data of where you are flying to give you the real world data. A good internet will also enable you to get real time data on weather, ATC traffic communication and many others.
One more thing.....You need a system upgrade to really enjoy this beauty and the highest capacity, in fact, you need specs better than the recommended system requirements. Invest in a SSD, good CPU with 6 cores or more and a good GPU RTX 2060 and up is what I recommend. 16GB RAM or more, 8GB is not enough for this game and it will be lagging when you play at high graphics setting. 6Gb Vram is good but not sufficient, I recommend 8GB VRAM.