The phrase "several months" refers to a period of time that is not specified as being exact, but rather an extended duration. It typically ranges from 3-6 months or more and can vary depending on the context in which it's used.
After waiting for several months for its release, I'm over the moon that it's here at last! (indieroot.com)
The person at the hospital told her that an appointment had been scheduled for several months ago, and a letter was sent to our old property. (law.stackexchange.com)
I was experiencing what would be the first of several months of panic attacks. (birthwithoutfearblog.com)