OK.

Basically no laws can deny you of making a living, you can take up 3-4 jobs work 7 days a week also can.

Check with your employment contract and see whether you have violated any.

Employer perspective: yes they can get all the details if they want to.

Yes you can work all you want but when your deliverables become of questionable quality and put under microscope, then you will know who means serious business.

Better have all your documentation to side you when that happens.

Just to get your thoughts on this. How will they find out? Assuming this has been going on for months and I have been getting 2 salaries with EPF & Socso are you telling me that they already know but they are just not doing anything?

exactly...that 8 hours particular working time is specified and need to complied with.

you cannot suka-suka work 8pm-3am and then say you worked 8hours.