>>51212368It entirely depends on your goals and how much manpower you can pull together. For starters, you don't really need that much knowledge in programming if you're going to use Essentials unless you're planning to play with the scripts (though at this point you should probably just use Reborn or Rejuvenation as a base and build off of them).
Next you would want to list out the scope of your game, what you want for a plot, how many maps you need to do, what sprites you would need to finish (spriting and mapping will take up 90% of your time). Then the next big step is making sure any events you have actually work and don't conflict with each other somewhere.
The process is for the above could literally take from a few months to over a decade just depending on what you want to do. Want to make a regular 8 gym game with FRLG sprites and tiles and everything with a route or cave between gyms? Could take literally a few weeks solo. Want to make Reborn's 18 gyms with extravagant maps, redone sprites and art for nearly everything, massively multilayered events, expansive postgame, whatever? Even with a large team it took over 10 years not counting the dev time on Starlight Divide, and while a lot of that was touchup for early game material even if you just didn't care about quality consistency you're still probably looking at 5+ years solid of just making a game like that.
