Spinners and weavers longed for the ten hour day!

I work for twelve hours of the day
Then set off home again
And when the Factory Act is passed
I'll only work for ten

From Wikipedia; The Factories Act 1847, also known as the Ten Hours Act was a United Kingdom Act of Parliament which restricted the working hours of women and young persons (13-18) in textile mills to 10 hours per day. The practicalities of running a textile mill were such that the Act should have effectively set the same limit on the working hours of adult male mill-workers, but defective drafting meant that a subsequent Factory Act in 1850 imposing tighter restrictions on the hours within which women and young persons could work was needed to bring this about. With this slight qualification, the Act of 1847 was the culmination of a campaign lasting almost fifteen years to bring in a 'Ten Hours Bill'; a great Radical cause of the period.

Difficulties immediately arouse over the enforcement of the act, as millowners used legal loopholes to evade its provisions and the courts proved reluctant to intervene so that Lord Ashley, for example, concluded in 1850: "The Ten Hours’ Act nullified. The work to be done all over again". Supplementary acts in 1850 and 1853 did, however, see a ten-hour limit established in the textile industry, and without the negative economic effects its opponents had feared to come to pass. Thereafter the use of child labour certainly declined in Victorian Britain, though historians divide on whether this was the result of the law in action, as the Factory Prosecutions Returns would seem to suggest, or merely a by-product of technological change.