The Trades Union Congress says Britain's policy of allowing companies to opt-out of the European Union Working Time Directive, meaning people to work over the 48-hour a week limit on a "voluntary" basis, meant the protection it offered could be circumvented.
Participants come from all over the world, work in different time-zones and donate their time after (and sometime while) dealing with day jobs and family.
For example, a large-scale survey conducted in Canada found that as work hours increased and flex-time arrangements became rarer over the last two decades, the percentage of respondents who rated themselves as highly satisfied with their lives plunged by 50% over the same period.