Fire alarms should be tested weekly by the building users. Any fire alarm system should be tested and serviced by a competent person annually.
Escape/emergency lighting should also be tested weekly, to ensure that the LED lights show that the batteries covering emergency egress are charging.
Each month the lights should receive a short test to ensure they illuminate correctly when the power is disconnected.
Every six months they should be tested for at least a duration of one hour in order to check the life of the rechargeable batteries. Every 12 months they should be tested for the full designed battery life, usually three hours.