time-stamp-line-limit

time-stamp-line-limit is a variable defined in `time-stamp.el'.
Its value is

8

• This variable is safe as a file local variable if its value
  satisfies the predicate `integerp'.

Documentation:
Lines of a file searched; positive counts from start, negative from end.
The patterns `time-stamp-start' and `time-stamp-end' must be found in
the first (last) `time-stamp-line-limit' lines of the file for the
file to be time-stamped by M-x time-stamp. A value of 0 searches the
entire buffer (use with care).

This value can also be set with the variable `time-stamp-pattern'.

Do not change `time-stamp-line-limit', `time-stamp-start',
`time-stamp-end', or `time-stamp-pattern' for yourself or you will be
incompatible with other people's files! If you must change them for some
application, do so in the local variables section of the time-stamped file
itself.