Param(
	[Parameter(Mandatory=$true, ValueFromPipeline=$true)]
	[string]
	$Process,

	[Parameter(Mandatory=$true, ValueFromPipeline=$true)]
	#[string]
	[ValidatePattern("^(\d\.){0,1}(([0|1]\d)|(2[0-3])):[0-5]\d:[0-5]\d")]
	$TimeSpan,

	[Parameter(Mandatory=$false, ValueFromPipeline=$true)]
	[ValidateRange(0, 1000)]
	[Int]
	$MaxWarn = 1,

	[Parameter(Mandatory=$false, ValueFromPipeline=$true)]
	[ValidateRange(0, 1000)]
	[Int]
	$MaxCritical = 0
)

Function ProcessesExceeding
{
    Param(
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        [string]
        $ProcessName,
        [Parameter(Mandatory=$true,ValueFromPipeline=$true)]
        [TimeSpan]
        $MaximumRunTime
    )
    Process
    {
	Get-Process | ? { $_.Name -eq $ProcessName -and ((New-TimeSpan $_.StartTime) -gt $MaximumRunTime) } `
        | % { Add-Member -InputObject $_ -MemberType NoteProperty -name TotalMinutesRunning -value (New-TimeSpan $_.StartTime).TotalMinutes -PassThru }
    }
}

$parsedTime = [TimeSpan]::Parse($TimeSpan)
$procs = ProcessesExceeding $Process $parsedTime

$running = if ($null -eq $procs) { 0 } else { $procs.Length }

$averageRuntime = if ($null -eq $procs) { 0 } else { $procs | measure-object TotalMinutesRunning -ave | % { [Math]::Round($_.Average, 2) } }
$status = if ($running -ge $MaxCritical) { "Critical" } elseif ($running -ge $MaxWarn) { "Warning" } else {"OK" }

Write-Host "${status}: Processes Running More Than ${parsedTime}: $running|'$Process'=$running;$averageRuntime;$MaxWarn;$MaxCritical"