This seems to be ignorant of the use of one-week sprints on some projects.
Also, what kind of sprint lasts "around 15 days"?
Sprints are always fixed-length (scope is varied to fit the sprint). Two-week sprints are used by some, but nobody does 15 day (aka two weeks plus one day) sprints.
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"Each "Sprint" lasts around 15-30 day"
This seems to be ignorant of the use of one-week sprints on some projects. Also, what kind of sprint lasts "around 15 days"? Sprints are always fixed-length (scope is varied to fit the sprint). Two-week sprints are used by some, but nobody does 15 day (aka two weeks plus one day) sprints.
For some, 15 days is exactly 3 work weeks.
15 working days is 3 work weeks. "Exactly 15 working days" might be a reasonable length for a sprint, but "around 15 days" is not.