If users press the digit or key specified in the DTMF dialpad, then they have a predetermined amount of time to enter subsequent numbers before the system times out.

Timeout behavior in Collect Input actions

Architect also times out after a set period if a user enters less than the specified number of digits or digits in the range. Set the number of digits or range in the Collect Input data action in task sequences. To direct the system to wait a specified number of seconds with no entry before timing out, set up a No Entry Timeout. To direct the system to wait a specified number of seconds between each numeric entry before timing out, set an Inter-Digit Timeout. 

Set the No Entry Timeout higher than the Inter-Digit Timeout. By default, the No Entry Timeout is 5 seconds and the Inter-Digit Timeout is 3 seconds.