It only took me day to get to 100,000 gold and that was with randoms and a lot of losses.
And how much of the day did you then spent on it?
I know if i spent my 6 free hours a day on it, i will have about 30.000 gold. But it is rare i get that chance for a multitude of reasons.
So i'll probably get 15-24.000 gold a day which in of itself is not bad.
But when you have BPs piling up and you want to try out the other character too, the grind becomes overwhelming.
Most people have 3-8 hourse a day for games in my country, and if we say a typical mission takes about 20 min, it is not gonna be much gold.