The format to issue this command is  DELAY
This command causes a delay affecting all activity on the client — events, alarms,queued commands and even prop animations — for the duration specified by number.  In other words, it stops all activity on the client for n seconds where n is the time you decide.

Delay times are measured in ticks (1/60 of a second) Note that SETALARM and ALARMEXEC are preferred since they don't lock up all processes on the client, although use of the DELAY command might be appropriate in a game, or as a penalty for breaking some house rule. The following example from the Iptscrae manual suggests one possible use:

ON ALARM {
foulMouthFlag GLOBAL
{ USERNAME ", you have been flagged for swearing. You have been sentenced to 30 seconds of dead time. If you persist you will be kicked off the server." & LOCALMSG
1800 DELAY
} foulMouthFlag 1 == IF }