I clean houses for a living and I want breast implants; could I go back to work in 4 days?

Honestly, no.  At 4 days after surgery, that's when you will be at your most swollen and tender.  Particularly with your physical job, I would recommend at least 7-10 days off, and no heavy lifting or upper body straining for 3 weeks.

Obviously, you can do whatever you want to do, however, in my practice, I tell patients not to resume strenuous activity for three weeks following surgery.