How to trigger a constant for a certain amount of time after an event?

Hi Guys, I'm very new to SimuLink and this is the first time I've had to use it. I'm designing a controller for controlling the torque output to electric motors depending on driver request. The timer is used to control peak and nominal torque.

I've created a timer using the Add block with the output looping back in and various switches to control the other additions to the add block. What I need is, when the timer is >= 10 seconds I get an output to remain constant (lets say 1) for 20 seconds (this is the cooling time needed on the motor), I have a method to control the torque, I just can't get an output to stay constant for a set amount of time when that 10 second event is triggered.

Any ideas will be much appreciated!

Thanks, Dan