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Totally, 9 bands.

1.band 3 around 1000 words

2.band 4 approximately between 2000-4000 words.

3.band 5 approximately between 4000-5000 words.

4.band 6 approximately between 5000-7000 words.

5.band 7 approximately probably between 6000-10000 words.

6.band 8 at least 10000 words ,meanwhile,luck befall u that day.

7.band 9 currently, impossible to obtain.

I'm a one IELTS facilitator in Shenyang.

Infor only for reference!