In powershell:
notepad C:\Users\$env:USERNAME\Documents\PowerShell\Microsoft.PowerShell_profile.ps1
function time {
$sw = [Diagnostics.Stopwatch]::StartNew()
Invoke-Expression ($args -join " ")
$sw.Stop()
Write-Host "Time elapsed: $($sw.Elapsed)" -ForegroundColor Cyan
}
. $PROFILE