The company I applied to, wants candidates to build a basic system in 4 hours. This simple application includes typical CRUD behaviours and maybe some business rules. I have 5 days for preparation and I'll have 4 hours to implement it from scratch. I know the concepts of O/R mapping and I've read the Concepts section of LLBLGEN Pro documentation. I have done a very very simple mapping with another O/R Mapper before.

I'm planning to use LLBLGEN, instead of .NET's strongly typed datasets. Is it possible for me to learn using fundementals of LLBLGEN in 5 days?

5 days for just CRUD is possible, just read the 'Using the generated code' for the details, as well examine the examples we provide on the website. 4 hours of implementing an app isn't much though, a silly bug could take more than 4 hours to hunt down.