That's a very common mistake newbies do, wanting to make that one epic big MMORPG just isn't going to work. Important thing is a game needs to be actually fun to play, you should start by making a simple prototype using placeholder assets and trying to experiment with only the core mechanics present, then build up from there. That in itself can already be pretty challenging, but if you succeed you'd have a better understanding of what you are doing, and most importantly you'd have *something* that kinda works. If you start burning out, focus on a different side of the project, like making assets or level planning, just make sure you open the IDE once per day and DO something, even if it's just writing 2 lines. Procrastination is a killer. Always remember to keep the scope tight, because feature creep will never stop and you'd always have new ideas. Maybe that idea isn't that good in practice, don't be afraid to abandon it and focus working on something different.

Depends on the game, really. "Hours to finish" isn't a good measure of complexity.

2 years for a solo dev doesn't seem realistic if you are aiming shippable quality, unless you are making some kind of a mobile "game". Besides, you'd be constantly learning new stuff while developing it, and you might quickly burn out the moment things stop going smoothly. Discipline and good time management are very important. Keep it simple, and try to familiarize yourself with the software first before trying to think of such estimates for your "dream game", they are never right.

holy shii Terry was a fucking genius for real

https://www.youtube.com/watch?v=7uLzaKlZSQQ&t=79