How long does it usually take to hear back from a teaching job?

I had a pre-screening with HR, then I went in for the interview with the principal- 7days ago. Today I took a thank you letter and found out that the Principal is off for the Summer. How long does it usually take to find out if you got the job? Would they go on summer break before deciding? I asked the HR lady and she seemed to know nothing but she did say there was a delay because of change of positions within the distrct and that they should have sent out letters out already.