Once Bar Counsel has filed proof of service of the petition with the Board Office, the Executive Attorney shall promptly set a date and place for the hearing on the petition and assign the matter to a hearing committee; the Executive Attorney shall send written notice of same to respondent and Bar Counsel. The notice shall also inform respondent of his right at the hearing to be represented by counsel, to cross-examine witnesses, and to present evidence in defense or mitigation of the charges. Absent extraordinary circumstances, the hearing shall be set for a date not less than fifteen (15) days after the date of service of the notice nor more than thirty (30) days after the date on which respondent’s answer is due pursuant to Rule 7.5.