I have never really timed how long it takes from start to finish for the whole process. But it is well worth the time.
Place on ungreased cookie sheet. Dip flat bottom glass in oil, then in sugar. Flatten each ball with glass. Dip glass in oil only once but in sugar for each ball. (I just give them a little tap and move on to the next one.)
Cool on wire racks. I put 2 dozen cookies on a cookie sheet. Makes about 6-7 dozen cookies.