The deadline is a guide and NOT mandatory. As long the terms have not reach mutual agreement, the booking form is still valid past the date.

2 months is normal for some cases if lawyers want to 'show off' their superiority knowledge.

Nobody is at fault for failing to reach mutual understanding on the terms in the agreement. If such thing arises, is for both party again to mutually agreed to terminate the booking form without admitting fault.

Meanwhile, if the seller has another buyer with a higher offer, he has to WAIT.