For a true basket weave knot that can be tied with two strands, the number of intersections in each direction cannot have a common divisor.
Within this constraint, there is no theoretical upper limit to the size of a basket weave knot.
However, large basket weave knots have a tendency to twist and curl because they are completely flat.
[1] A basket weave knot can be tied from a single strand by first forming a bight in the middle of the line.
In the carrick bend, which is otherwise similar to the double coin knot, the standing ends enter opposite long sides.