How to add the timer into the interface ?

community.appian.com/.../timer-function-in-interface

Declare a local variable with the time period and have show when for specific section  in the interface 

a!localVariables(

/* specify the time in minutes or hours when you want to end the exam */
local!flag: now() + minutes * 30,
local!showWhen: a!refreshVariable(
value: now() < local!flag,

/* specify the interval after how many minutes you want to end the exam */
refreshInterval: 30
),
a!cardLayout(
showWhen: local!showWhen,
content:{

}
)
)

Hope this will work

Give it a try :-)

Next time, please