[Dovecot] How to handle "Waiting for authentication process..."

[A.L.E.C]

Sometimes, when dovecot authentication processes are busy, dovecot write
reply "Waiting for authentication process to respond.." to client.
Roundcube webmail do not understand it and invalidate user session.

My question is what is a good practise to handle this situation by
client software? One Roundcube user proposes to detect such response
then wait a moment and try again. Is there any standard for this? How
long should we wait?

More info here: http://trac.roundcube.net/ticket/1487450

-- 
Aleksander 'A.L.E.C' Machniak
LAN Management System Developer [http://lms.org.pl]
Roundcube Webmail Developer  [http://roundcube.net]
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PGP: 19359DC1 @@ GG: 2275252 @@ WWW: http://alec.pl