Custom Login Handler - Level of Effort?

[Quint Van Deman]

Shib Users--

I'm currently planning for a project that may necessitate the
development of a custom login handler, one which validates the users
identity against a remote web service.  For anyone who's gone through
the process before, what was level of effort required to construct a
custom login handler in a rough order of magnitude?  In reviewing the
content on the wiki
(https://wiki.shibboleth.net/confluence/display/SHIB2/IdPDevExtLoginHandler)
it doesn't look tremendously difficult, but first hand experience is
always a better gauge.

Thanks,

-Quint