WScript.Sleep

Suspend the execution of the current script for the specified number of milliseconds.

Syntax 
       WScript.Sleep lngTime

Arguments:
         lngTime is the delay in milliseconds

Example

WScript.Sleep(5000)
WScript.Echo("5 seconds have passed.")

Note - early versions of this function were buggy, use WSH 5.6 (Win XP) or greater

“Success isn't permanent, and failure isn't fatal” ~ Mike Ditka

Related:

Equivalent Windows CMD commands: SLEEP - Wait for x seconds, WAITFOR - Wait for or send a signal.
Equivalent Powershell command: Start-sleep