Process Run Time

I've been attempting to make a change to this script to get the longest instance of a process via the Title.

The modifications i have made work fine locally, but not through SAM:

Function UpTime($ProcessTitle)
{
$Process = Get-Process| Where-Object {$_.MainWindowTitle -LIKE "*$ProcessTitle*" } -ErrorAction SilentlyContinue
$Date = Get-Date

If($Process -eq $null)
{
$Uptime = '0'
}
Else
{
If($Process.Count -eq $null)
{
$Uptime = ($Date.Subtract($Process.StartTime)).TotalMinutes
}
Else
{
$Sorted = $Process | Sort-Object StartTime
$Process = $Sorted[0]
$Uptime = ($Date.Subtract($Process.StartTime)).TotalMinutes
}
$Uptime = [int]$Uptime
}
Return $Uptime
}

$ProcessTitle = $args[0]
$Uptime = UpTime $ProcessTitle
Write-Host 'Message: The longest instance of process' $ProcessTitle 'has been running for (in minutes)'
Write-Host 'Statistic: '$Uptime