sc-cite-region-limit

sc-cite-region-limit is a variable defined in `supercite.el'.
Its value is

t

Documentation:
This variable controls automatic citation of yanked text.
Valid values are:

non-nil -- cite the entire region, regardless of its size
nil -- do not cite the region at all
-- a number indicating the threshold for citation. When
the number of lines in the region is greater than this
value, a warning message will be printed and the region
will not be cited. Lines in region are counted with
`count-lines'.

The gathering of attribution information is not affected by the value
of this variable. The number of lines in the region is calculated
*after* all mail headers are removed. This variable is only consulted
during the initial citing via `sc-cite-original'.

You can customize this variable.