Ian Thorpe wants you to know that enrolling to vote in the upcoming postal plebiscite on marriage equality takes no time at all.
In fact, you can do it faster than his partner Ryan Channing can swim 100 metres (which is less than a minute).
"If you support marriage equality you need to enrol to vote or update your details," Thorpe said in the video, before challenging Channing to try and swim the distance in the time it takes to enrol with the Australian Electoral Commission (AEC).
Given the enrolment process is as easy as confirming the details of your name, place of residence and an AEC verification code, it won't come as a surprise to know that Channing lost the challenge. But for him, there's more on the line than that.
"Every Australian should have the right to take the plunge with the person they love," he said.
Thorpe, Australia's most successful Olympian, first opened up about his sexuality in 2014 and has spoken about his journey coming out to family and friends.
While postal plebiscite voting forms will start being sent out on September 12, the deadline to ensure you're enrolled is much earlier. If you want you ensure your vote will count, Thursday, August 24 is the cut-off date by which you need to have updated your details.
After September 12, you will have several weeks to return the form to the ABS, with the final cut-off being 6pm on November 7.
Thursday, August 24 -- the cutoff to enroll to vote or update your enrollment details
Tuesday, September 12 -- voting forms start being sent out
Wednesday, October 11 -- requests to replace damaged or lost form closes
Friday, October 27 -- the date all Australians are strongly encouraged to return forms by
Tuesday, November 7 -- final deadline to return forms
Wednesday, November 15 -- survey results released
The form will ask just a single question, and will include a return paid envelope and instructions on how to complete it. So all you have to do is fill it out and post it back.
All the responses will be anonymous and the ballots will be destroyed within 60 days of the survey results being published on November 15.