Like any other entity scrum sprint also has certain properties that you should be aware of, like:
Timeboxed – Literally almost anything in a sprint is time-boxed, whether it is a scrum event or the sprint itself
Timeboxing helps the team to focus and allows the space for discipline and closed boundaries for any planned activity
It creates a cadence and also helps in gathering metrics on steady intervals
Protected from any changes – According to Scrum Guide “Once the team has made a commitment in the Sprint Planning, the scope of the sprint will be locked. Any changes in the commitment in terms of scope change is not encouraged. But if the change is small enough to be incorporated in a sprint, the team should follow the suggestions listed in Agile Manifesto.
The maximum duration of a sprint should be 2-3 weeks long.