Final answer:
Adding a curing agent or accelerator can shorten the setting time of condensation silicone rubber.
Step-by-step explanation:
The **setting time** of condensation silicone rubber can be shortened by adding a **curing agent** or **accelerator**. The curing agent helps to initiate the **crosslinking reaction** which is responsible for the solidification of the rubber. By increasing the concentration of the curing agent or using a more reactive one, the setting time can be reduced.