The HSK testing committee never really makes it clear to the test taker when he or she will know his test results. Luckily, you have us.
In general, you should expect 40 to 60 days before you can receive your results. The results will appear on chinesetesting.cn before they arrive in the mail. So, check this site about one and a half months after you take the test. Log in with your data, and you should be able to get your results.
Also note that your speaking results will come out more slowly than the reading/listening/writing test. The only thing I can tell you is to be patient.