This team from Lubnan
(51910) started when I was the Lubnan U21 coach. In Lubnan there are currently 8 active teams, and probably more than a half are semi-bots. He connected from time to time and I gave him some advice, but of course he was not a full-time manager.
He makes 528k $/week and he can win the Lubnan League and Cup with a roster cheaper than 100$. A experienced manager would win both even with much lower salaries than him. That means more than 400k $/week. He just need to hire a good trainer, but not a good doctor or PR manager. He can spend 20-30k $/week in the draft and 20-30$ in the trainer. If he does things well he will get back those 20 $/week and more in draft players to sell or train. An experienced manager will be able to train 6 player/week at 2 positions or 3 player/week. He can also be the NT coach and put his own player to play and get experience, get money in merchandising, and he can also sell them at higher price because of the "flag". Of course he can also make much more money by speculating with the transfer market. And I´m probably missing something...
So it's not extra 250k/week, it might be double, triple and more, and of course things will go exponentially faster.
3, 4, 5, 6 seasons? 1 year, 1 year and a half, 2 years???
¡Me aburro! (Homer Simpson)