What to do if the Editor is not responding to my repeated e-mails? This is in reference to my previous question:
How to mail the editor asking to withdraw my submission?

I wrote to the editor regarding my problem for 2 consecutive days.
I sent 4 mails to him regarding the withdrawal of my manuscript.

But I have not received a single reply from him.

How long should I wait? I know he is busy too but I need to do it fast as my Masters (Research) course will end in 2 months and I need to have it at least communicated if not published within this duration.

Otherwise I won't get my degree.
But why is the Editor not replying to my e-mails?

I need to resubmit it fast to either this journal or another journal.

Please help me, I don't understand what should I do.
Giving someone 2 days to respond to an email, especially about a submission, is no where near long enough. I wouldn't expect a response that fast for virtually anything. 4 emails is definitely excessive.

For a journal, I would expect 2 weeks to be a reasonable amount of time on this. Generally, anything of this nature is not urgent. You can certainly go ahead and begin preparing to submit the paper elsewhere (e.g., find a journal, correct your paper's mistake, and reformat the paper), but don't submit it yet.