Yeah it is too much, takes 18 hours of my day, that is why I can't carry it in the long run after 5 days as I started feeling sick and my body gave up. I will take it more slowly from now on!
18 hours a day of dedication to a single goal, will get you anywhere. the whole point it is hard to be consistent, while burning yourself out, before seeing results.
Its a huge investment of your time and energy, that you will find whether is profitable only in X months from now, if at all.
Don't get me wrong tho, i do vouch for the long run and for building a business rather than relaying on a method.
But that's not exactly the case, because it is a method (to get engagement on tiktok) which you can't know for sure whether it will turn into a business.
Let alone expecting to keep going like this for 2 years, i love the ambition i really do, i just think that if you have it in you, you will find a better place (or direction) to put your energy in.
if it was even somewhat profitable, or you were certain it will one day be, i would simply suggest you to outsource the content creation, and automate the uploading, but if you wouldn't waste your money on a "long shot" well, some people wouldn't waste their time, its the same equation.
Anyway, if you do believe in it, you would keep doing it, so best of luck with this!