Workload (noun)

1. The amount of work that a person has to do.
2. The amount of work that a machine, system, or organization has to do.

Origin:

Early 20th century: from work + load.

Examples:

1. The workload is heavy.
2. The system was unable to handle the workload.
3. The workload for the nurses is increasing.
4. The workload for the engineers was too much for them to handle.