We are often called out to rekey locks after someone moves into a new home. This was a newer home and had the original door hardware. The entire job took about an hour which included getting to chat with my lovely customers.
This house was my favorite kind of rekey. The house had three knobs and three deadbolts. Pretty standard. However, the deadbolts were an older style. Modern deadbolts require a 2 1/8 bore, the hole in the door. These deadbolts were 1 5/8.
Moving into a new home is expensive. Rekeying their locks allowed them to maintain security while saving the cost of replacing all of the locks.