Hi Gary.

A lot can be any size. Generally, what we mean is a "property" or "yard". An urban lot can be fairly small, a suburban lot is generally bigger and a lot in a rural area is often quite large.

Municipalities, counties, and similar organizations often have "standard" lot sizes that they define themselves. Sometimes they might say "this is a double-lot property", meaning the size of the property is twice the normal lot size, although what "normal" means is something defined by the juridiction involved. There's no "standard" lot size in mathematics.

Stephen La Rocque.