Limit script to only reboot 20 machines at a time

Good morning,

$Computers = Get-ADComputer -Filter * -searchbase "OU=branch,DC=net,DC=Company,DC=co,DC=uk" | Where-Object {$_.Name -like "*TM*"} | Select -Property Name

ForEach ($Computer in $Computers) {
	If (Test-Connection -ComputerName $Computer -Quiet) {
		& shutdown.exe -m "\\$($Computer)" /f /R
	} Else {
		"$($Computer) is not online" | Out-File -Append "C:\Powershell Projects\reboot script\computersnotonline.txt"
	}
}

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Right, so this works fine, it enumerates the machines with the correct names from the specified OU.

How can I make it limit the reboot to 20 and wait 20 seconds until each machine is back up?

Thanks

Alex