1. Invitation from a Valid Sponsor – To apply for an Australia visitor visa, you must have an invitation from an eligible sponsor who confirms that you are invited to visit them in Australia.
2. Valid Passport – You must hold a valid passport and apply for the visa outside of Australia in order to travel to Australia.
3. Adequate Funds – It is important to have enough funds to cover your stay in Australia and your return travel expenses.
4. Genuine Intent – You must have a genuine reason for visiting Australia and must stay within the time-frame specified in your visa.
5. Health Requirement – Depending on the duration of your visa, you may be required to undergo a health assessment as part of the visa application process. Additionally, you must be of good character and have no criminal convictions.

The duration of an Australia visitor visa may vary depending on the purpose of your visit and your individual circumstances. It can range from up to 12 months or even longer, and the visa may also permit multiple entries.

The processing time for an Australia visitor visa from India is typically reasonable, and applicants are advised to submit a decision-ready application. The processing time is usually between 18 to 24 days.