<cfset r = Randomize(TimeFormat(Now(), "ll"))>
<cfset x = 0>

<cfloop query="queryname">

    <cfif RandRange(1,10) eq 5>
        <cfset x = x + 1>

        <!--- put your stuff here --->
    </cfif>

    <cfif x eq 8>
        <cfbreak>
    </cfif>

</cfloop>