Fill in the Blanks 1211muskOnline version 1211musk by John E 1 are Others started CEO worked a company unhappy increases said work changed is said hours loves Businessman Elon Musk people must up to 100 hours a week to " change the world " . Mr Musk SpaceX , Tesla , and PayPal . His companies have our lives . He a workaholic . He working . He said : " There easier places to work , but nobody ever changed the world on 40 a week . " Mr Musk " everyone " at Tesla has 100 hours per week at times this year . Some workers are with their long hours . like to work 70 hours per week . Musk said the " pain level " above 80 hours a week . The of a billion - dollar works about 70 hours week .