I can really understand your concern. It took me about 2 months after my diagnosis to figure out that I had too many lesions to even count because the neuros were evasive when I asked them. They did tell me I had more than 9 greater than 2 cm. and I have no idea how many smaller ones I have.
I know it's really hard to grasp that there is little correlation between the number of lesions and your symptoms and/or disability, but from what I've read in the 2 years since I've been diagnosed that is definitely the case. Some people have very few lesions but significant disability while others have lots of lesions and relatively little, if any, disability. My neuro only does MRIs if they're needed to make treatment decisions and so far the only ones I had were to confirm the diagnosis.
I've been diagnosed a little over 2 years and am still working full time, managing a house and yard and having some fun to boot.
I really don't know though what is considered "a lot" of lesions.
It's good you're doing well. In 2 years I think I've learned not to worry about how many lesions I have.
Hopefully some others will respond as well. It's entirely possible someone knows what's "a lot" of lesions. My take on it is just that, my take on it.