It may be possible that you’re able to take care of that many, but I’ll share with you the questions I ask myself when thinking about taking on another cat:
1. Will I have time to pet the cat every day, at least twice a day?
2. Will I be able to spot the early signs of illness (observing lethargy, change of eating / drinking / toilet habits, etc.)?
3. Will I be able to afford the veterinary care if one of my cats gets sick every month for the next 3 months?
4. What will I do if one of my cats requires treatment or vet care totaling $500 or more, within a 6 month period of time (comparable cost to the deductible on my auto insurance and house insurance)? Common cost in my area is approx. $250-300+ for vet visit & full blood panel.
As with everyone, I have limits. I’ve figured out that these kinds of questions help me determine if I’ll be able to take good care of my kitties, or if perhaps someone else might be able to take care of one or two or more of them, better than I could. It’s part of what caused me to part with the mama kitties and kittens from the last two stray/feral litters I took on.
I kept two kittens, because one was still pretty feral/skittish, and the other is homely; but there’s no way I could have sustained the effort and expense of being a responsible owner for more than that. (I have 6 cats right now, and sometimes I wonder if that’s too many.)
I strongly recommend thinking about these kinds of scenarios. None of them are far-fetched, especially when you’re talking about 11 cats or more, and especially if an infectious disease (upper respiratory infection) arrives and begins to affect 2 or more cats.