[Dovecot] Disconnect IMAP session after certain time?

[Jan-Piet Mens]

Is it possible to have Dovecot cleanly terminate an IMAP
session after a certain time? I have a number of users
who leave their MUA (Mozilla Thunderbird) on all night,
and I'd like to have them (cleanly) disconnect in order
to free up resources after a certain "inactivity" time
(e.g. 2 hours).

Can that be done?

	-JP