Should I feel bad for handing my notice in?

Handed in my notice. There's one other person at my workplace who can perform my duties. They have been seriously overworked recently. I have pretty much just became competent at my role. And now I am leaving. I have to relocate. I feel bad about only handing two weeks notice in. Should I? I feel like I should have given them more time. But, on the other hand, I am paid minimum wage and so don't get paid any extra for performing my 'specialised' role....

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