/.timername <i> <d> <c>
name - Whatever you care to name the timer, avoid using numbers for names as some of those are reserved. There is no space between the name and the word timer.
<i> - The number of intervals, for this case you only need 1.
<d> - The delay time or time to wait between intervals.
<c> - The command to execute on each interval.
As an example to your question:
/.timerCloseIt 1 10 dialog -x listmaster
This starts a timer named CloseIt that, after a single interval of 10 seconds will close the dialog and stop.