Once you place an offer on a house,
a fast sale can typically occur within 3-4 weeks.
Time is needed for several processes.
the offer you make needs to be accepted by the seller.
Most offers have a 24 hour expiration.
if the seller counter-offers,
you will have 24 hours to accept.
Once the offer stage is complete,
the house is under contract.
The house will need to be inspected,
by either or both a private inspector that you pay for,
as well as an ainspector from the lender.
there is a negotiation process to determine what failed on items on the inspection will be corrected before the final sale occurs.
Once the final sale occurs,
the house has changed ownership.