This is a common question. Particularly because a fiancé visa, correctly known under the Australian Migration Regulations as a prospective marriage visa, can only be applied for and granted offshore.
It cannot be applied for and granted whilst your fiancé is in Australia.
This can cause some hardship as in most cases the sponsor, who must either be an Australian citizen, Australian permanent resident or eligible New Zealand citizen, will have work and employment commitments in Australia and cannot wait in Thailand for his fiancé’s visas to be granted.
This period of separation can cause a strain on a relationship.
Processing times for a fiance visa
As a general guide only processing is usually between 3 to 6 months after the application has been lodged with the Department of Immigration and Citizenship (DIAC), but it can take shorter or longer, depending upon the overseas post where the application is lodged and whether there are any complexities with the application. Department of Immigration and Citizenship policy is however, that family visa application processing should take priority over other visas such as skilled migrant visas.
Remember too that a fiancé visa ultimately leads to Australian permanent residency for the applicant, so there is a lot of criteria that needs to first be satisfied before the visa can be granted to the applicant. A visa application can be delayed for any number of reasons such as lack of supporting documents submitted with the visa application, delay in obtaining police clearance certificates and medical reports.
As a rule you should submit a thoroughly prepared application that includes all supporting documents that have been certified and translated if necessary. A complete application will avoid any unnecessary delay in processing. If the case office has to keep constantly requesting further documentation this will significantly delay the processing of your fiancés visa.