Simple Powershell script to get files older than 30 minutes. Obviously adaptable as needed.

GetFilesOlderThan30Mins.ps1

$fullPath = "D:\path\to\directory"
$numDays = 0
$numHours = 0
$numMins = 30

function getOldFiles($path, $maxDays, $maxHours, $maxMins) {
  $currDate = Get-Date
  #Get all children in the path where the last write time is greater than 30 minutes. psIsContainer checks whether the object is a folder.
  $oldFiles = @(Get-ChildItem $path -include *.* -recurse | where {($_.LastWriteTime -lt $currDate.AddDays(-$maxDays).AddHours(-$maxHours).AddMinutes(-$maxMins)) -and ($_.psIsContainer -eq $false)})

  if ($oldFiles -ne $NULL) {
	  $oldFileCount = 0

    for ($i = 0; $i -lt $oldFiles.Length; $i++) {
      $oldFileCount += 1
      $thisFile = $oldFiles[$i]
      Write-Host ("This file is old '" + $thisFile.Name + "' - " + $thisFile.LastWriteTime)
    }

    Write-Host ("A total of " + $oldFileCount + " old files were found.")
  }
}

getOldFiles $fullPath $numDays $numHours $numMins

Nice script - thanks! :)