measure command time

time.ps1

function time([scriptblock]$scriptblock) {
    $sw = [Diagnostics.Stopwatch]::StartNew()
    . $scriptblock
    $sw.Stop()

    Write-Output ""
    Write-Output "  >> Execution time: $($sw.Elapsed)"
}

time { Install-Module -Name PSWindowsUpdate }

$categories = 'Critical Update','Security Update','Definition Update','Service Pack','Update Rollup'
time { Get-WUInstall -Install -Category $categories -Verbose -AcceptAll -IgnoreReboot }