Notice of hearings, both published and written, shall state, in addition to the time, place and purpose of the hearing, the location of the lot, tract or structure involved and the nature and extent of the relief sought and the general nature of the question involved. Notice of said hearing shall be conspicuously posted on the affected tract of land. The hearing shall be held within 60 days from the date of the applicant's request, unless the applicant has agreed, in writing, to an extension of time.