For how long must foam be discharged during a handline nozzle test on a paved surface?

The duration for discharging foam during a handline nozzle test on a paved surface is 30 seconds. This specific timeframe is established to ensure that the foam can effectively demonstrate its capability to provide adequate coverage and suppression across the designated area, replicating real-world firefighting conditions. The 30-second duration allows for enough foam to be applied, ensuring it meets performance standards and allowing evaluators to observe the characteristics of the foam, such as expansion, stability, and drainage. This testing period is vital for maintenance protocols and to affirm that the equipment is functioning correctly for eventual emergency use.