We bought this for our niece, who is very much into gems and stones. She was so excited when she opened it and wanted to get started right away. It was EXTREMELY unfortunate that the process would take SEVEN DAYS - and that's just to complete step one! The rocks have to tumble continuously in the tumbler for seven days - that's 168 hours of listening to rocks tumble around. Needless to say, her mother was LESS than pleased. They ended up shutting it off and never going back to it after just a day and a half. What a disappointment!