There is no determined processing time as all cases can be different. Average processing of partner visas are currently being published on the Department of Home Affairs website as:
- 75% of applications: 21 months
- 90% of applications: 28 months
If you apply in Australia for a partner visa you will be granted a Bridging Visa which will become active when your current visa expires, to allow you to remain in Australia until your partner visa is determined.