You can work as much as you want if you're self-employed. But regular employee contracts are limited to full-time. Overtime is not allowed to be regularly abov

You can work as much as you want if you're self-employed. But regular employee contracts are limited to full-time. Overtime is not allowed to be regularly above the weekly limit. As a full-time student you're not allowed to work more than 20hrs/week. Even with multiple contracts/companies there is a limit on hours you're allowed to work. It's all a worker's protection issue. Tired workers are dangerous workers and workers that will cost the health service more in the end.