Recently I was offered a chance to be a sorter in the LVD(Low Volume Distributor) on my load belt. I took this as a chance to advance, and I was given three half days (about six hours this week to "learn"). I didn't sort on Thursday-Fridayn due to the need of people loading. I had been waiting for this chance, and by the third day I threw only about 10 missorts. I had been chance for a year and a half, and recently as we were closing out I saw another guy (that has about 8 months seniority) up there. I know it is a Friday night and we are going down, but I was angered and I feel that three days is not an accurate time for me to become proficient at the job. My supervisor had even said on Wednesday that I was getting better.I asked my superviosr about and and she said that she was going to think about it and that she and the other supervisor would talk about it when he got back from vacation. I was wondering if they decide that I don't get it, if the union or my full-time could be consulted to help give me a fair shake. All I wanted was a fair share, and I go on vacation in two weeks (about the same time that the job becomes available).