We don't set a hard limit on the amount of jobs you can have.
However, the more jobs you have, the more data that needs to be loaded every time you view a page.
If you have an older computer or a slow Internet connection, you should try and keep your active jobs* under 200.
Even with a modern computer and a decent Internet connection, you may start seeing performance slowing down when you get over 500 active jobs*.
If you have more jobs than this, please speak to us about how you can use groups to improve your performance.
*Active jobs are jobs loaded in vWork that have not been completed yet.