I have purchased some time ago a SCJP 1.5 voucher with a free retake option.
From what I understand, a minimum of 7 days were required before retaking the exam.
Quoting from the certification page:
Sun's Certification Retake Rules:
* There is a 7-day minimum wait period before retaking a failed exam.
* You can retake the same exam a maximum of three (3) times in one calendar year.
* After the third failed attempt within one calendar year, you must obtain written permission from Sun prior to attempting a fourth time by sending an email request to email@example.com.
* An exam cannot be retaken once it has been passed.
However, in JavaRanch FAQ writes that this period is 2 weeks.
My voucher expires on 30 april and I want to know that, if I attend it on 20, 21 or 22 april I still have time to retake it, if needed.