from the knowledge I have I can suggest you the following; however, you may want to confirm this with someone.
As you wife was the primary applicant for 489 Visa and she came to Australia on 10 Dec 2018 so you 2 years complete on 10 Dec 2020 but,
as you were out of country for more than 28 Days you need to cover all those days; However; if you look at your travel date.
29th November 2019 to 10 December 2019 is 11 Days so you have less than 28 days for 1st year
10 DEC 2019 to 1 Jan 2020 for 2nd year is 20 days so you also have less than 28 days. So you may not need to cover those days.
You may want to confirm with an agent or you could write a letter of explanation stating what I just said up about breakdown of your holidays and upload it in other Docs.
good luck m8