Limit "number of projects to scan at once" by time?

How about removing the selectbox from admin/l10n_server/l10n_localpacks and replace this with a time based logic? I've re-used the logic that job_queue have implemented in linkchecker and this works great.

Here is an example:

  $result = db_query("SELECT * FROM {foo}");
  while ($foo = db_fetch_object($result)) {
    // Execute time consuming process.

    if ((timer_read('page') / 1000) > (ini_get('max_execution_time') / 2)) {
      break; // Stop once we have used over half of the maximum execution time.
    }
  }