You'll need to set up your timer command to accommodate that:
Set timer for 2 minutes
Set small int (condition) [TimerTime] value to 120
Start Loop While : [TimerTime] Does Not Equal 0
Pause 1 second
Set small int (condition) [TimerTime] value as decremented by 1
End Loop
Say, 'Timer is up'
Don't forget to check the "Allow other commands to be executed while this one is running" option.
How much time is remaining on the timer?
Say, '{SMALL:TimerTime} seconds remaining on timer'