The big difference between contract work and self-production is production time--with the former, the script and characters have already been set by the contracting company, so a single film can take as little as six months to complete; however, the profits for the work are small.
代工與自製最大的差別，在於前者執行時，由於劇本與角色已經由業主設定，一部作品只要 6 個月就能搞定，但利潤不高。