https://www.reddit.com/r/PowerShell/comments/5n5aux/way_to_tell_how_long_the_last_command_took_to_run/dc8umh2/

dastylinrastan-profile.ps1

# By dastylinrastan
# https://www.reddit.com/r/PowerShell/comments/5n5aux/way_to_tell_how_long_the_last_command_took_to_run/dc8umh2/

# Chocolatey profile
$ChocolateyProfile = "$env:ChocolateyInstall\helpers\chocolateyProfile.psm1"
if (Test-Path($ChocolateyProfile)) {
  Import-Module "$ChocolateyProfile"
}

#Justin's Powershell Prompt
function prompt {
    function Test-AdminElevation {
        # Check for Administrator elevation
        $wid=[System.Security.Principal.WindowsIdentity]::GetCurrent()
        $prp=new-object System.Security.Principal.WindowsPrincipal($wid)
        $adm=[System.Security.Principal.WindowsBuiltInRole]::Administrator
        $IsAdmin=$prp.IsInRole($adm)
        return $IsAdmin
    }

    $promptUser = $env:username.toLower()
    $promptDomain = $env:userdomain.ToUpper()

    if (Test-AdminElevation) {
        $adminColor = "Red"
        $endPrompt = "#"
    } else {
        $AdminColor = "Green"
        $endPrompt = ">"
    }

    #Get relative home location
    function Write-PromptLocation {
        $currentLocation = Get-Location

        #Set the default in case we don't do anything special
        $promptPath = $currentLocation.Path

        #If this is a filesystem path, replace $HOME with ~ if present
        if ($currentLocation.Provider.ToString() -eq 'Microsoft.PowerShell.Core\FileSystem') {
            $promptPath = $currentLocation.ProviderPath -replace [RegEx]::Escape($HOME),'~'
        }

        return $promptPath
    }

    #Look for PoshGit and write the VCS status as appropriate if available
    function Write-PromptGitStatus ([switch]$PreLoad) {
        #PoshGit Discovery
        #Only run once per powershell session, to keep performance high
        if ($SCRIPT:promptPoshGitStatus -eq $null) {
            #First see if PoshGit and Git are in the normal path.
            try {
                import-module Posh-Git -ErrorAction stop
                get-command git.exe -erroraction Stop | Out-Null
                $SCRIPT:promptPoshGitStatus = $true
            } catch {
                $SCRIPT:promptPoshGitStatus = $false
            }

            #If not, look for GitHub for Windows
            if ($SCRIPT:promptPoshGitStatus -eq $false) {
                try {
                    #Try importing the GitHub for Windows environment
                    . (Resolve-Path "$env:LOCALAPPDATA\GitHub\shell.ps1" -erroraction stop)
                    import-module "$env:github_posh_git\posh-git.psm1" -erroraction stop
                    $SCRIPT:promptPoshGitStatus = $true
                }
                catch {
                    $SCRIPT:promptPoshGitStatus = $false
                }
            }
        }

        if (!($preload)) {
            if ($SCRIPT:promptPoshGitStatus) {
                write-vcsstatus
            }
        }
    }

    #Get Execution Time of Last Command
    function Get-LastCommandTimeString {
        $lastCMDTime = ""
        $lastCMD = get-history -count 1

        #Avoids showing time when an empty "enter" key is hit
        if ($script:PromptLastHistoryID -eq $lastCMD.ID) {return}
        $script:PromptLastHistoryID = $lastCMD.Id

        if ($lastCMD) {
            $lastCMDTime = ($lastCMD.EndExecutionTime - $lastCMD.StartExecutionTime)
            $lastCMDTimeFormat = "mm\:ss\.fff"
            if ($lastCMDTime.Hours) {
                $lastCMDTimeFormat = "hh\:" + $lastCMDTimeFormat
            }

            [PSCustomObject]@{
                duration = $lastCMDTime.ToString($lastCMDTimeFormat)
                command = ($lastCMD -split ' ')[0]
            }
        }
    }

    #Workaround to ensure the prompt loading isn't delayed by Posh-Git Module Initialization
    Write-PromptGitStatus -PreLoad

    $lastCMDTimeString = Get-LastCommandTimeSTring
    if ($lastCMDTimeString) {
        write-host -NoNewline -ForegroundColor DarkGray '['
        write-host -NoNewline -ForegroundColor DarkGray $lastCMDTimeString.duration
        write-host -NoNewline -ForegroundColor DarkGray '] '

        #write-host -foregroundcolor DarkGray ')'
        #write-host -NoNewline -ForegroundColor DarkGray $lastCMDTimeString.command
        #write-host -foregroundcolor DarkGray ')'
    }

    write-host -NoNewLine -ForegroundColor Cyan '['
    write-host -NoNewline -ForegroundColor $AdminColor ($promptDomain + "\" + $promptUser)
    write-host -NoNewLine -ForegroundColor Cyan ']'
    Write-PromptGitStatus
    write-host -ForegroundColor DarkCyan (" " + (Write-PromptLocation))

    return ($endPrompt + " ")
}