$ pg_sql/pgsql.HEAD/hstore/create_hstore.sh
 rowcount |  size
----------+--------
  1000000 | 249 MB
(1 row)

Time: 183.026 ms
Time: 184.673 ms
Time: 183.903 ms
Time: 0.295 ms
Time: 0.245 ms
Time: 0.274 ms