I will ask staff at Vilnius airport if my bags can be checked all the way back to Sydney, as I wasn't aware of the codeshare agreements Etihad and AirBaltic have. But if I can't do that and I had to clear customs, one hour and fifteen minutes should be sufficient, right? Even if my flight is about 10-15 minutes late.

I'm also working on the assumption that the Etihad checkin counter closes one hour prior to departure (which is where I get my 1:15 figure)