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Booted into the Windows 8 recovery menu to see if I could decrypt my secondary HDD with the recovery tools. Found that I can do it in the dos prompt there after unlocking the drive.

However, after typing this:

X:>manage-bde -off C:

The output can be found below. There is NO indication of how long its going to take:

BitLocker Drive Encryption: Configuration Tool version 6.2.9200

Copyright (C) 2012 Microsoft Corporation. All rights reserved.



Decryption is now in progress.



X:Sources>

Did I miscalculate? Should it be showing me the decryption progress? Or is this expected and should I go back to bed and do it's thing until tomorrow (it's an SSD)?

The answer is "it is expected." From a command prompt run as admin, use the following to check the status of the decryption:

manage-bde -status C:

Booyah! You should see the following output:

BitLocker Drive Encryption: Configuration Tool version 6.2.9200

Copyright (C) 2012 Microsoft Corporation. All rights reserved.



Volume C: [Windows 8.1 Pro]

[Data Volume]



  Size:                         238.47 GB

  ... Edit: There is more below including decryption status, too much to type ...

Source: Technet on manage-bde command line tool

Got tired of command line bumping to see. This shows status, progress, estimated time to complete. To exit, ctrl-c or it stops when converted

# Author - Jack D. Pond

# license: Available under the Creative Commons Attribution-ShareAlike License  additional terms may apply.

# Description: DecryptRemainingStatus   

# 

#    1. Escalates to administrator (if not already)

#    2 Uses the "Write-Progress" to create a bar and provide some status

#       information (as well as anticipated length based on current) for

#       decryption status

#

# NOTE:  You need executable status for powershell scripts.  If you get an error:

# If you downloaded this, you need to unblock the script

# See what your current execution ability is:

#   Get-ExecutionPolicy

# Set it to something reasonable (temporarily)

#   Set-ExecutionPolicy -ExecutionPolicy RemoteSigned

# Don't forget to reset it to whatever it was before (In this case, Restricted) after your run the script

#  Set-ExecutionPolicy -ExecutionPolicy Restricted

# 

# @Params

# 

# -seconds [number of seconds in each monitor interval, defaults to 5]

#

# @example:

#

# PS>.DecryptRemainingStatus.ps1 -Seconds 10

#

# Get "Seconds" param

#

[CmdletBinding()]param(

    [int]$Seconds = 5

)

# Set-PSDebug -Trace 1



#elevate to "Administrator" (Required for manage-bde)

If (-NOT ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator"))

{  

    $arguments = "& '" + $myinvocation.mycommand.definition + "'" + " -Seconds $Seconds"

    Start-Process powershell -Verb runAs  -ArgumentList $arguments 

    Break

}

[int] $millisecs = ($Seconds -as[int])*1000

[decimal] $xval = 100

[int] $intervals = 0

$xtext = (((manage-bde -status C: | findstr "Encrypted").trim()) -split 's+')[2]

[decimal] $startval = ($xtext.substring(0,$xtext.Length - 1) -as[decimal])

while ($xval -gt 0) {

    $xtext = (((manage-bde -status C: | findstr "Encrypted").trim()) -split 's+')[2]

    $xval = ($xtext.substring(0,$xtext.Length - 1) -as[decimal])

    [decimal] $completed = ($startval-$xval)

    [timespan] $elapsed = New-TimeSpan -Seconds ($intervals*$millisecs/1000)

    [decimal] $secsleft = If ($startval -gt $xval) {($intervals/($completed)*$xval)*($millisecs/1000)} Else {-1}

    Write-Progress -Activity "Remaining Encrypted: $xtext Elapsed: $elapsed Completed: %$completed)" -PercentComplete (100-$xval) -status "Decrypting" -SecondsRemaining $secsleft

    Start-Sleep -Milliseconds $millisecs

    $intervals += 1

}

echo "Decryption Finished"

pause

Put this in a bat file and run it. Leave it running in a command terminal.

@echo off

SET /A"timer=0"

manage-bde -status G: |findstr Percentage >initial.txt

:while

cls

manage-bde -status G: |findstr Percentage

SET /A "timer=timer+1"

SET /A "mins=timer/60"

echo %timer% seconds ( in minutes: %mins% ) passed. Counting since: 

type initial.txt

ping 127.0.0.1 -n 2 > nul

goto :while

del initial.txt

This will show you when you have started to count seconds you will wait for 20 minutes or so and see how many % has it progressed. With simple math you will get what you want. Terminal Output

I have kept the code simple on purpose.