Hi Jerrybee,
Normal time frame for victoria is 3 clear business days if you haven't specified a time frame within your offer.
So you'll have this in the contract:
This offer will lapse unless accepted within[...............]clear business days(3 clear business days if none specified.
You can insert a time frame in the above brackets^.
Personally i prefer an answer in 24hrs.
Cheers Spades.