This is the 10220th most frequent Japanese word.
限っ
"限っ" is the stem form of "限る" (kagiru), which means "to limit" or "to restrict."
The word '限られている' means 'is limited', indicating a constraint in the context of time.
時間が限られているため、早く始めましょう。
Since time is limited, let's start quickly.
Here, '限っています' means 'is limited to', specifying restrictions applied to the service.
このサービスはメンバーに限っています。
This service is limited to members.
The phrase 'とは限りません' conveys uncertainty or that something is not guaranteed.