This article demonstrates the varied and unpredictable nature of earning in the nineteenth century. Using 12,000 fortnightly pay entries from Townley Main Colliery in the north-east of England as a case study, it explores the extent to which the availability of work fluctuated between years, and how workers reacted to this phenomenon. It then considers the frequency with which these individuals undertook the work which was available, and discusses the implications for our understanding of the length of the working year.