The Multinational Time Use Study (MTUS) brings together more than a million diary days from over 100 randomly sampled national-scale surveys, into a single standardised format. MTUS allows researchers to analyse time spent by people in various sorts of work and leisure activities, over the last 55 years and across 30 countries.Jonathan Gershuny first developed MTUS in the mid-1980s. Working with Sally Jones at the University of Bath, he developed a single dataset with a common series of background variables and total time spent per day in 41 activities. The MTUS has expanded since then and offers harmonised episode and context information, including recent data from the Harmonised European Time Use Survey (HETUS), American Time Use Survey (ATUS), and other national- scale time use projects.