The 8 day break for the top team is not set in stone.
Previously the AFL has used a broad range of factors when programming the Prelims. I seem to recall one year when they switched it so the travelling team had a full 7 days to recover ( Cough maximise television audience Cough advantage to Victorian team).
Or perhaps I'm paranoid!
If we finish top, and win a home prelim, it'll be Friday night.
In 2012 the Hawks finished top and had to play on the Saturday (against us) which wasn't fair. Since then the highest ranked prelim final is the Friday night.