$ time echo "
   explain analyze select * from dna_test order by seq
" | psql -1qtAd test > dna_test.order_by_seq.explain_analyze.txt

real    57m44.054s

$ cat dna_test.order_by_seq.explain_analyze.txt
Sort  (cost=35550611.84..36003765.76 rows=181261568 width=62) (actual time=1834228.291..3428773.879 rows=181261572 loops=1)
  Sort Key: seq
  Sort Method:  external merge  Disk: 12933032kB
  ->  Seq Scan on dna_test  (cost=0.00..3872406.68 rows=181261568 width=62) (actual time=17.966..65802.621 rows=181261572 loops=1)
Total runtime: 3463580.243 ms