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VFS Global, through which you apply for a visitor visa for Australia, has varying instructions for bankbook or bank statements. Depending on country of application, they range from 3 to 6 months.
However, the VFS Global instructions for South African applicants directs you to the Department of Home Affairs checklist which simply states:
Evidence of sufficient funds, such as personal bank statements, pay slips, audited accounts or credit card limit
If you're at all uncertain, bank statements for the last 3 months should suffice, particularly if you do not have other evidence (e.g., pay slips or credit card predetermined limit).