SLEEP.exe (Resource Kit)

Delay execution for a few seconds/minutes (for use within a batch file.)

Syntax
      SLEEP time

Key
   time  The number of seconds to pause

For example:
To pause for an hour before running the next command in a batch file:

SLEEP 3600

Alternative
A delay can also be produced by the PING command with a loopback address (127.0.0.1), in tests this consumes less processor time than Sleep.exe or Timeout.exe:

e.g. for a delay of 30 seconds:
PING -n 31 127.0.0.1>nul

See Clay Calvert's newsgroup posting for a full explanation of this technique.

“I think men talk to women so they can sleep with them and women sleep with men so they can talk to them” ~ Jay McInerney

Related:

TIMEOUT - Delay execution for a few seconds/minutes (for use within a batch file.)
WAIT - the same as sleep but with noises
WAITFOR - Wait for or send a signal.
WScript.Sleep - Sleep
Powershell: Start-Sleep - Suspend shell, script, or runspace activity (sleep)
Equivalent bash command (Linux): sleep - Delay for a specified time