DrBlender
Are there any limits or subscriptions?
No. No subscription, no trial, no account, no limits.
Does it change my .blend files?
No. The history is stored in its own folder, so your files are never touched.
What happens if Blender crashes?
The running session is saved every 30 seconds and recovered on the next start.
I work on two computers.
Set the same synced data folder (Dropbox, OneDrive, NAS) on both. Each computer writes its own log, so nothing conflicts, and totals combine.
Does it count time when I'm away?
No. After the idle limit the counter stops. It picks up again when you come back.
How is activity detected?
On Windows, from system input while a Blender window is in front. On macOS and Linux, from your work inside Blender (edits, undo, saves and editor updates).
Does it send any data anywhere?
Never. No internet, no telemetry.
What is the little "More tools" link?
A small link to my other add-ons. Click ✕ to hide it for a couple of weeks, or switch it off for good in the preferences.
How to reset Timers? (for older verion)
Under Properties in addon chceck box you have options to reset timers in active file: 
How To install addon? (for older verion)
Download the .zip file (DON'T unpack it)
go to blender
Edit > preferences > addons > install ( navigate to .zip file) > and enable chceckbox
And then you will find addon under scene properties:
If it's still not working:
Make sure you using newest and supported version of blender.
Chceck if it's installed, remove and try again.
Go to folder in windows: appdata > blender foudation, > sripts > addons > oh my time
and then delete corupted files, and reinstall addon.
Where to find timer? (for older veriosn)
You will find addon under scene properties:
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