Nothing bad will happen to you if you don't shower for 2 days.
Unless you have bad body odor that you have to deal with or you get dirty from working outside or in really dirty conditions then there's no need to really shower everyday.
I mostly shower everyday especially when I have work to go to but on weekends I may go the whole weekend without showering because I just don't feel like taking a shower.
Usually I just want to relax and and do other things so sometimes on the weekend I don't show and nothing bad happens.
I can't really tell of any odor unless I have just gotten used to it but nobody has said anything to me when I don't shower for a few days.
Showering too often can dry out your skin and be bad for it so if you want to skip a few days of showering there's nothing wrong with it.