You’ll need administrator privileges to use these command. You can also run them from a command prompt in recovery
Turn off Encryption
manage-bde -off C:
Change C: to the drive that has BitLocker on it. Check with the status command. May not be C if your in recovery.
Also note that after the encryption is turned off it takes awhile to decrypt. Check with status command
Unlock BitLocker Encrypted Drive
manage-bde -unlock C: -recoverypassword 11111-...-99999
Replace C: with actual drive
Replace the numbers at the end to your actual recovery key.
There are a few different ways to view the system uptime. either the Task Manager or the Command Prompt.
Launch the Task manager by using the Ctrl+Shift+ESC Shortcut keys, Right clicking on the Task Bar, or by searching and launching from the start menu.
Go to the Performance tab, view Up time at the bottom (On Windows 10 you may need to hit More “details first”
Launch the Command Prompt. Can do this by clicking start and searching for cmd.
systeminfo | find "System Boot Time"
It’ll show you when the system last started up.
C:\Users\Owner>systeminfo | find "System Boot Time"
System Boot Time: 6/21/2018, 3:45:12 AM