Futaba PCM may not have a delay setting, but there is a delay.

At loss of signal, the receiver will hold all outputs at the last received setting for one second. After the one second hold period, the servo channels that have been setup with failsafe values go to those values.

You can turn the transmitter off and observe the one second delay before the receiver sets the servos to their failsafe positions.

Futaba transmitters have a boot up time of a second or two, so you can't verify that the receiver didn't go to failsafe if the loss of signal was less than a second by simply turning the transmitter off then on within one second. You could pull the module and replace it quickly, or generate interference from a second transmitter.