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12-18 months is what McKinsey says, but this can vary by firm.
Some firms will say 6-12 months so they should check the email communication they received from the recruiting team. Also, some practice areas are different (e.g. McKinsey’s Marketing and Sales practice says 6 months).
You can apply for the same firm in the same year if you are applying to a different role. For summer internship, yes you may apply again.
You may also be allowed to apply for a full time role even if you were rejected for a summer internship role.