The term 'put in long hours' can be summarized by two crossword solutions: TOIL (4 letters) and SLAVE (5 letters). TOIL is defined as hard, physical labor, while SLAVE is defined as a person who is owned and forced to work for another. Both terms imply that someone is working for an extended period of time with little to no rest. This type of labor is often associated with low-wage jobs and those who are unable to find other employment.