Time the replication of an Active Directory DNS record

Get-AdDnsReplicationTime.ps1

#Requires -Version 4.0
#Create your record and then immediately run this script
$domainSuffix = '.my.domain.edu' #domain suffix for less typing
$client = 'dept-joe04' #client to query for on the DCs
$DNStype = 'CNAME' #type of DNS record to query
$DCs = @('dc-01','dc-02','dc-03','dc-04')  #DCs to query against
$DClength = (-join $DCs).Length #for determining when all DCs have answered
$DCdone = '' #string that collects DC names as they answer

Write-Output "Checking $client at $(Get-Date)"
do {
    foreach ($DC in $DCs) {
        if ( $DCdone -notmatch $DC ) {
        $check = Resolve-DnsName -Name $client$domainSuffix -Server $DC$domainSuffix -DnsOnly -Type $DNStype -ErrorAction SilentlyContinue
            if (!$check.IPAddress -eq '') {
                Write-Output "`t $DC answers `t $($check.IPAddress) at $(Get-Date)"
                $DCdone += $DC
            }
        }
    }
    sleep 1
}
while ( $DCdone.Length -lt $DClength)