Hello, as mkh9 said, it is very commone for lymph nodes to stay swollen for quite a while, especially if you have a more "severe" case of EBV/mono. Honestly, I would look at it as a good thing. Why? It's a sign that your body's immune system is fighting the infection. Of course it's easy to worry, but I would really stress not to... your body is working as it should! Hope this helps, and hope you get back to "normal" soon!
Yes lymph nodes can stay swollen for a while. Did you have mononucleosis caused by the EBV? With mono, you have fever for about 10 days, your spleen can be swollen for 4 weeks , fatigue can last 2-3 months. So, I would expect the lymph nodes to be swollen about 2 months or maybe more. Do you still have symptoms? I wouldn't worry about it but they should resolve at some point. Your other symptoms will go away first followed by the lymph nodes.
mkh9