I can’t bring up a good estimate, but 15 -
20 hours seems fairly accurate with a good train, with even more for feeding and all. (Probably double in your case, like damn 70k feed O_O)
The maximum fame to exp ratio ends at 220, so doing those is probably the most efficient system, it’s like 2-3 minutes of tutorial, another 2-3 to level, then 10 or so to get to 220. And yeah, the walls suck
I ended up giving up on the god fame bonuses, but they might be more efficient to have.
Also, I’m not sure how the trains are right now, especially with the event going on, so it may take longer or shorter than usual.