Originally Posted by AzureWinter

At this point I am sure I could. The last 80 stamina daily I tried was for one of the manyu groups and I couldnt do it, but that was several days ago, and my team has improved significantly since then.
When should I be ready to start farming 12-3?
My lead team has a power of 39k, and the other 3 are between 23k to 29k.

What player level does it become viable at too, because I have 179 stamina right now, and I know the advance mission costs 80 stamina alone...

Player Level only matters, when you are not online often enough to never waste your natural stamina Regen.
You can just start pushing towards 11-1, where the advanced garden starts to spawn. If your team doesn't make it until there, you know you have to farm some more in the early areas.