If you're from India or China, Google has strictly said to apply only after 6 months. But I don't think you need to wait that much. If you have unique quality textual contents, then you'll eventually be accepted if you apply after 2 months or so. Till that time, make more followers and more quality hubs.
If you're not from India or China, then wait for a month and then apply. After applying for AdSense, make a hub in between. Google will watch your account carefully and see your potential!!