overcharged my zenbook UM425UG

[tsy29_]

I off and accidentally overcharge my laptop for 12 hrs  for the 1st time. should i be worried ?

[Falcon_ASUS]

@tsy29_
Laptops have protective mechanisms, so please don't worry.
As for daily usage, we suggest referring to the following FAQ information for guidance. 
[Notebook] ASUS Battery Information Center
ASUS Battery Health Charging - Introduction
Thank you.

[Randywfl]

Not sure what you mean by "for the 1st time".
If you mean first time you charged the battery then I would  not worry.  I try to keep my battery level at around 50%, but I also have smart charging enabled inside the MyAsus app.  If you don't have it then I recommend you get it and enable the smart charging to prevent charging above 80% as seen here:

If you don't have and can't get the MyAsus app, then you should not make 12 hour charging a regular practice.  The Battery should reach full charge in less than 2 hours or so.
NOTE -- You can check battery level as follows:
  1.  press the Windows key.
  2. Click the Settings Icon.
  3. Click the [System] option in the left frame.
  4. Scroll down on the right side and click the [Power and Battery] option.