I would give it until Tuesday of next week, and if you haven't heard anything back, I would give the HR Dept a polite courtesy call. I have had similar things happen to me in the past. Sometimes people just get busy and fall behind. Sometimes things slip peoples' minds, sometimes work is delegated to someone that doesn't get the job done. There is no harm in politely calling back to find out the status of your application. If anything, it shows that you are serious about wanting to work there. I once applied to the same job 3 times before I was hired. I was told I was not the initial favorite candidate, but my persistance and determination won them over. Good luck.