Well depends on your project.
Can you describe a little bit better what kind of project do you have right now?
Because if you have too much complicated processes it could take you some time.
I recommend to take a look at the jBPM5 documentation page in order to see the new APIs and how the project looks right now.
I've have being writting some examples as well that you can find it here:
https://github.com/Salaboy/Drools_jBPM5-Training-Examples
Inside the jBPM5 examples.
Esteban was also writing some more advanced ones that we will be publishing soon:
https://github.com/esteban-aliverti/JBPM-Samples
Greetings!