idle processes

'ps axu' shows:

postgres 1249 0.0 0.7 20200 7296 ? S
11:50 0:00 postgres: user1 database1 127.0.0.1 idle
postgres 1251 0.0 0.6 20196 7036 ? S
11:50 0:00 postgres: user1 database1 127.0.0.1 idle
postgres 1264 0.0 0.3 19936 3200 ? S
11:50 0:00 postgres: user1 database1 127.0.0.1 idle
postgres 1267 0.0 0.2 19936 2992 ? S
11:50 0:00 postgres: user1 database1 127.0.0.1 idle
postgres 1274 0.0 0.2 19936 2996 ? S
11:50 0:00 postgres: user1 database1 127.0.0.1 idle
postgres 1275 0.0 0.2 19936 3000 ? S
11:50 0:00 postgres: user1 database1 127.0.0.1 idle

Any idea why these processes are hanging around (for
about 20 minutes)? There's not any other query hogging
that database. Will they eventually timeout?

(PostgreSQL) 7.4.1

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