14. Is there a limit on the amount a donor can contribute to a political party during a non-election specific period?

Donations can be made continously and are required to be reported in political party annual returns. The same provisons apply with respect to the threshold for disclosure of donations regardless of when they are made, or how frequently.

Sources: Australian Election Commission Transparency Register  see https://www.aec.gov.au/Parties_and_Representatives/financial_disclosure/transparency-register/

Disclosure threshold see https://www.aec.gov.au/Parties_and_Representatives/public_funding/threshold.htm

The Australian Electoral Commission is required to publish annual returns by political parties, political campaigners, associated entities, third parties and donors before the end of the first business day in February each year after the return is provided. Annual returns are published on the Commission's Transparency Register. 

Source: Australain Election Commission Transparency Register, see  https://www.aec.gov.au/Parties_and_Representatives/financial_disclosure/transparency-register/