Powershell countdown

function CountDown($waitMinutes) {
    $startTime = get-date
    $endTime   = $startTime.addMinutes($waitMinutes)
    $timeSpan = new-timespan $startTime $endTime
    write-host "`nSleeping for $waitMinutes minutes..." -backgroundcolor black -foregroundcolor yellow
    while ($timeSpan -gt 0) {
        $timeSpan = new-timespan $(get-date) $endTime
        write-host "`r".padright(40," ") -nonewline
        write-host $([string]::Format("`rTime Remaining: {0:d2}:{1:d2}:{2:d2}", `
            $timeSpan.hours, `
            $timeSpan.minutes, `
            $timeSpan.seconds)) `
            -nonewline -backgroundcolor black -foregroundcolor yellow
         sleep 1
        }
  
    }

while (-1) {
    Countdown 1
    }