Ann: Entitlement Offer Closes, page-22

Not intending to scare everyone but....taken from

'The Allens handbook on
takeovers in Australia' 2013

Length of offer period
The offers must remain open for at least one month.
The offer period can be extended by a further
period, subject to an aggregate offer period of not
more than 12 months. Most bids are made for the
minimum period of one month and then extended
as necessary to secure sufficient acceptances. If the
offer is conditional, any extension must be effected
before the ‘status of conditions’ notice is filed (see
paragraph (h) below for a description of this notice).
The only exception to this is where a rival takeover
bid is announced or improved during that last 7-day period. The offer period will be automatically
extended if within the last 7 days the consideration
is improved or the bidder’s voting power increases
to more than 50%. In that case, the offer period is
extended by 14 days from the relevant event.
If the offer period is extended by more than 1 month
(or by a cumulative period of more than 1 month)
while the offer remains conditional, every target
securityholder who accepted the offer before the
extension is entitled to withdraw their acceptance.