Hello World !

I would like to have a feedback and / or estimation of your development speed for Hibernate mapping.
I have a new project in the pipeline, and I'd like to get a fairly accurate estimate of a point that I can't be able to anticipate today.

Basically, I have an XSD. Via XJC, I am able to generate all .java required for this application.
Then, I modify by hand the XJC generated classes, to describe my hibernate mapping and allow the persistence of my data in a relational database.

Order of magnitude: 300 classes, 2500 getter, 1200 simple relationships, 250 multiple relationships.
I've never been confronted with such mapping size, and I would like to confirm the duration I think the mapping require.

So my 10 cents questions:
- How long do you estimate such important work of mapping ?
- And if I have to add the XSD constraints (range, cardinality, value ...) in mapping, via the Hibernate Validator for example ?
- Is there a tool to automate it all (XSD → Hibernate mapping) ?

Thanks in advance